Difference between revisions of "CVM-H"

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The SCEC Community Velocity Model - Harvard (CVM-H) is a velocity model of crust and upper mantle structure in southern California developed by the SCEC community for use in fault systems analysis, strong ground motion prediction, and earthquake hazards assessment.
 
The SCEC Community Velocity Model - Harvard (CVM-H) is a velocity model of crust and upper mantle structure in southern California developed by the SCEC community for use in fault systems analysis, strong ground motion prediction, and earthquake hazards assessment.
  
−
[[File:CVM-H11.2.png|256px|thumb|right|The latest version of the SCEC Community Velocity Model (CVM-H 11.2) includes basin structures embedded in the 3D waveform inversion model of Tape et al. (2009), and an explicit representation of the Moho (after Yan and Clayton, 2007; Chulick and Mooney, 2002), and an optional arbitrary-precision Vs30-derived geotechnical layer for the top 350m (Ely et al 2011).]]
+
[[File:CVM-Hv5 1 0.png|256px|thumb|right|Perspective view of the northern part of CVM-H v15.1.0, showing an enlarged transect across the Los Angeles basin. An enlarged view of the shallow velocity structure in the basin shows the Geotechnical Layer (GTL), as described in the text. B) Cross sections showing Vp across the USR. LA is Los Angeles basin; SB is Santa Barbara basin; IB is Inner Borderland; ST is Salton Trough basin (Shaw et al., 2015)]]
  
 
== Overview ==
 
== Overview ==
−
The SCEC CVM-H velocity model describes seismic P- and S-wave velocities and densities, and is comprised of basin structures embedded in tomographic and teleseismic crust and upper mantle models.
+
[[File:CVM64 perspectve.png|256px|thumb|right|The latest version of the SCEC Community Velocity Model (CVM-H 15.1.0) includes basin structures embedded in the 3D waveform inversion model of Tape et al. (2009), and an explicit representation of the Moho (after Yan and Clayton, 2007; Chulick and Mooney, 2002), and an optional arbitrary-precision Vs30-derived geotechnical layer for the top 350m (Ely et al 2011).]]
  
−
This latest release of the CVM-H (11.2.0) represents the integration of various model components, including fully 3D waveform tomographic results. The CVM-H 11.2.0 consists of basin structures defined using high-quality industry seismic reflection profiles and tens of thousands of direct velocity measurements from boreholes (Plesch et al., 2009; Süss and Shaw, 2003). The basin structures are also compatible with the locations and displacements of major faults represented in the SCEC Community Fault Model (CFM) (Plesch et al., 2007). These basin structures were used to develop travel time tomographic models of the crust (after Hauksson, 2000) extending to a depth of 35 km, and upper mantle teleseismic and surface wave models extending to a depth of 300 km (Prindle and Tanimoto, 2006). These various model components were integrated and used to perform a series of 3D adjoint tomographic inversions that highlight areas of the model that were responsible for mismatches between observed and synthetic waveforms (Tape et al, 2009). Sixteen tomographic iterations, requiring 6800 wavefield simulations, yielded perturbations to the starting model that have been incorporated in the latest model release. CVM-H 11.2.0 also incorporates a new Moho surface (Yan and Clayton, 2007) and an upgraded geotechnical layer (GTL) based on a Vs30 map (Ely 2010), the Vp-density scaling relationship, and the code that delivers the model. The CVM-H version 11.2 provides three significant new capabilities:
+
The SCEC CVM-H velocity model describes seismic P- and S-wave velocities and densities, and is comprised of basin structures embedded in tomographic and teleseismic crust and upper mantle models. This latest release of the CVM-H (15.1.0) represents the integration of various model components, including fully 3D waveform tomographic results. We recommend use of the most recent version of CVM-H, in most cases.
−
*Vs30-based arbitrary precision GTL
+
 
−
*Extended Region using 1D background model
+
Improvements in version 15.1.0 include revisions to the basement surface that include the localization and displacements of faults in the Santa Maria Basin. This affects the boundary between the sediment and basement
−
*Standardized interface for removing topography
+
velocity parameterizations.
 +
 
 +
Previous improvements that appeared in version 11.9, and also appear in 15.1.0, include a newly compiled Moho surface, opening up the offshore Santa Maria basin to the western model margin, a detailed representation of the San Bernardino basin, a much smoother transition between low resolution area and high resolution area at its southern border in the Los Angeles region and removal of various small near surface artifacts.  The new Moho surface was compiled by Tape et al. from a large number of data sources, including global data sets, receiver functions and local studies. In replacing this surface care was taken that the depth interval around the Moho level both in the mantle and in the crustal portions of the model which were affected by this change, were assigned the correct domain, and consequently assigned velocities extrapolated from the underlying mantle model or from the crustal background model. In the offshore Santa Maria basin we extended the definition of the basement surface using reflection seismic data (McIntosh et al., 1991) to the very western margin of the model and to the north in order to remove an abrupt transition from the basin to background. We smoothly extrapolated sediment velocities from the onshore model into this new basinal area. Another basin, the relatively small San Bernardino basin, is now represented in the model. The basement surface is based on gravity data (Anderson, 2000) and seismic reflection data (Stephenson et al., 2004). To the west the basin is connected by a thin veneer of sediments to the Los Angeles basin whereas to the ESE the basin is represented as tapering out as is the case in other such basin representation. The ESE is the deepest part of the basin, and the data do not preclude a continuation of the basin in this direction. The Vp velocity structure in the basin is defined by stacking velocities (Stephenson et al., 2004) and a 1D velocity profile (Graves, 2004). Vs is derived from Vp using Brocher (2004). Finally, we removed a discontinuity in the velocity structure between the southern margin of the high resolution model in the Los Angeles area and the surrounding low resolution model. We modified the high resolution area by introducing a smooth N-S gradient in the delta between the low and high resolution models in a region at its southern margin.
 +
 
 +
The CVM-H 15.1.0 consists of basin structures defined using high-quality industry seismic reflection profiles and tens of thousands of direct velocity measurements from boreholes (Plesch et al., 2009; Süss and Shaw, 2003). The basin structures are also compatible with the locations and displacements of major faults represented in the [https://www.scec.org/research/cfm SCEC Community Fault Model (CFM)] (Plesch et al., 2007). These basin structures were used to develop travel time tomographic models of the crust (after Hauksson, 2000) extending to a depth of 35 km, and upper mantle teleseismic and surface wave models extending to a depth of 300 km (Prindle and Tanimoto, 2006). These various model components were integrated and used to perform a series of 3D adjoint tomographic inversions that highlight areas of the model that were responsible for mismatches between observed and synthetic waveforms (Tape et al, 2009). Sixteen tomographic iterations, requiring 6800 wavefield simulations, yielded perturbations to the starting model that have been incorporated in the latest model release. CVM-H 15.1.0 also incorporates a new Moho surface (Yan and Clayton, 2007) and an upgraded geotechnical layer (GTL) based on a Vs30 map (Ely 2010), the Vp-density scaling relationship, and the code that delivers the model.
  
 
== Current Release ==
 
== Current Release ==
  
−
SCEC CVM-H version 11.2.0 is scheduled to be released on Friday 25 February 2011.
+
SCEC CVM-H version 15.1.0 was released on Wednesday 11 February 2015.
 +
 
 +
Version 15.1.0 includes revisions to the basement surface that include the localization and displacements of faults in the on-shore Santa Maria Basin. This affects the boundary between the sediment and basement velocity parameterizations.
 +
 
 +
Version 11.9.1 represents an improvement on 11.9.0 and it is recommended that all users upgrade to this new version. Specifically, the latest iteration includes the following changes to the high resolution (HR) data set:
 +
*replaced about ten, seemingly random cells which were shallow in the basin and had a water tag with sediment and GTL tags (GTL tags are obsolete and can be considered equivalent to sediment tag)
 +
* vp63: replaced water velocity in retagged cells with average from surrounding cells
 +
* vs65: replaced all sediment tagged cells with values based on Vp using Brocher (2005). This resulted mostly in no change but fixed some cells (about 8) which were close to the southern edge and had no-data or negative values
 +
 
 +
=== Known Issues ===
 +
CVM-H 15.1.0:
 +
* None at this time.
  
 
== Dependencies ==
 
== Dependencies ==
 
The following software is required to build and run CVM-H.
 
The following software is required to build and run CVM-H.
−
*UNIX operating system (Linux, Solaris, MacOS)  
+
*UNIX operating system (tested on Linux and SunOS, untested on Solaris and MacOS)  
 
*GNU make  
 
*GNU make  
 
*tar for opening the compressed files
 
*tar for opening the compressed files
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== Downloads ==
 
== Downloads ==
 
To install and use the CVM-H, you need to download and build the CVM-H software distribution. There are detailed installation instructions on the [[CVM-H User Guide]]. The main steps involved in installing CVM-H include:
 
To install and use the CVM-H, you need to download and build the CVM-H software distribution. There are detailed installation instructions on the [[CVM-H User Guide]]. The main steps involved in installing CVM-H include:
−
#The software can be installed in an account on a Linux computer with at least 600G of disk storage and C compilers.
+
#The software can be installed in an account on a Linux computer with at least 600MB of disk storage and GNU C compiler and GNU compliant make.
−
#From this Linux computer, start a web browser and point to this download page. Alternatively, you can download the files to a different machine and use FTP or SFTP to copy them over.
+
#From the Linux computer, start a web browser and point to this download page. Alternatively, you can retrieve the files with SFTP or other retrieval software.
−
#Download the following two files (source, source md5sum) into a directory and run the md5sum program to confirm you have an undamaged version of the distribution files.
+
#Download the two CVM-H files (CVM-H source, CVM-H md5sum) into a directory and run the md5sum program to confirm you have an undamaged version of the distribution files.
−
#Uncompress the distribution (tgz) files into a local directory on your computer.
+
#Uncompress the distribution (tar.gz) files into a local directory on your computer.
−
#Build the executables by running the top level makefile.
+
#Configure the installer by running the ./configure script.
−
#Confirm the code is built correctly by running UnitTests.
+
#Build the executables by running the top level makefile ('make').
−
#Confirm the code runs correctly on your system by running AcceptanceTests.
+
#Confirm the code is built correctly by running the unit/acceptance tests ('make check').
 +
#Install the executables ('make install').
 
#Use CVM-H for research purposes.  
 
#Use CVM-H for research purposes.  
  
 +
Please note that, depending on your version of Linux or OS X, some additional steps may be required. If you run into the following error:
  
−
*'''SCEC CVM-H Source Code File (529 Mb tar (tgz) file)''': [http://hypocenter.usc.edu/research/cvmh/11.2.0/cvmh_11.2.0.tgz cvmh_11.2.0.tgz]
+
configure: error: cannot find install-sh, install.sh, or shtool in ./aux-config "."/./aux-config
−
*'''SCEC CVM-H Source Code md5sum File (small text file)''': [http://hypocenter.usc.edu/research/cvmh/11.2.0/cvmh_11.2.0.tgz.md5 cvmh_11.2.0.tgz.md5]
+
 
 +
Then please follow these steps:
 +
 
 +
#Install automake. On Ubuntu this is sudo apt install automake. On Linux systems with Yum, the command is yum install automake.
 +
#Run aclocal
 +
#Run automake --force-missing --add-missing
 +
#Run autoconf
 +
#Run ./configure --prefix=/path/to/install/cvmh
 +
#Run make, make check, and make install
 +
 
 +
{| class="wikitable" border="1"
 +
|-
 +
! Platform
 +
! File
 +
! Download
 +
! Mirror
 +
! Notes
 +
|-
 +
| Linux
 +
| '''SCEC CVM-H 15.1.1 Source (532 MB tar (tar.gz) file)'''
 +
| [http://hypocenter.usc.edu/research/cvmh/15.1.1/cvmh-15.1.1.tar.gz cvmh-15.1.1.tar.gz]
 +
|
 +
| Latest official release
 +
|-
 +
| Linux
 +
| '''SCEC CVM-H 15.1.1 md5 (small text file)'''
 +
| [http://hypocenter.usc.edu/research/cvmh/15.1.1/cvmh-15.1.1.tar.gz.md5 cvmh-15.1.1.tar.gz.md5]
 +
|
 +
| Latest official release
 +
|}
  
 
== Supporting Materials ==
 
== Supporting Materials ==
 
These posters and presentations may contain information about earlier versions of CVM-H. This information may be useful to some users.
 
These posters and presentations may contain information about earlier versions of CVM-H. This information may be useful to some users.
−
*[http://hypocenter.usc.edu/research/UCVM/CVM_H_11.2_summary.ppt Overview of CVM-H 11.2 (1Mb powerpoint file) ]
+
*[http://hypocenter.usc.edu/research/ucvm/CVM_H_11.2_summary.pptx Overview of CVM-H 11.2 (1Mb powerpoint file) ]
−
*[http://hypocenter.usc.edu/research/UCVM/Plesch_CVMH_PetaSHA_08.ppt Andreas Plesch Overview of CVM-H (2008) (7.4Mb powerpoint file)]
+
*[http://hypocenter.usc.edu/research/ucvm/CVM_H_11.1_summary.ppt Overview of CVM-H 11.1 (1Mb powerpoint file) ]
−
*[http://hypocenter.usc.edu/research/UCVM/CVM_H_scec2008poster.pdf CVM-H Poster SCEC Annual Meeting (2008) (1.8Mb pdf file) ]
+
*[http://hypocenter.usc.edu/research/ucvm/Plesch_CVMH_PetaSHA_08.ppt Andreas Plesch Overview of CVM-H (2008) (7.4Mb powerpoint file)]
−
*[http://hypocenter.usc.edu/research/UCVM/USR_Descriptions.pptx Overview of SCEC Unified Structure Representation (USR) Developments (4.2Mb powerpoint file) ]
+
*[http://hypocenter.usc.edu/research/ucvm/CVM_H_scec2008poster.pdf CVM-H Poster SCEC Annual Meeting (2008) (1.8Mb pdf file) ]
 +
*[http://hypocenter.usc.edu/research/ucvm/USR_Descriptions.pptx Overview of SCEC Unified Structure Representation (USR) Developments (4.2Mb powerpoint file) ]
  
 
== Help ==
 
== Help ==
Line 54: Line 101:
 
* Browse and submit new tickets at [http://northridge.usc.edu/trac/cvmh/ CVM-H Trac]
 
* Browse and submit new tickets at [http://northridge.usc.edu/trac/cvmh/ CVM-H Trac]
 
* Email software (at) scec.org with specific questions
 
* Email software (at) scec.org with specific questions
−
* Subscribe to email list cvmh-all (at) intensity.usc.edu to receive announcements about new version of the software.
+
* Subscribe to email list cvm-h-all (at) intensity.usc.edu to receive announcements about new version of the software.
  
 
== Software License ==
 
== Software License ==
−
The CVM-H software is released under the Apache 2.0 license as posted:
+
CVM-H software distributions are released under an Apache 2.0 open-source license as described here [[CVM-H License]].  
−
*[[CVM-H License]].
 
  
 
== Release History ==
 
== Release History ==
−
*11.2 - February 2011 - This is the first release of CVM-H that includes the Vs30-based geotechnical layer and the vx_lite user interface. This version also introduces a date-based version numbering scheme (Year.Month.Revision).
+
 
−
*6.3capi - November 2010 - This is an interim version of CVM-H for use in testing and evaluation. This version includes an initial version of the vx_lite interface but does not provide the Vs30-based geotechnical layer. This version is distributed for completeness and we do not recommended its use by researchers.
+
The CVM-H releases contain cumulative improvements to the geological models and software interfaces. We recommend using the most recent version of the software, in most cases.
−
*6.3 - August 2010 - This version CVM-H, released by the Harvard Structural Geology Group, removes all [[CVM-S]] geotechnical information and restores the original CVM-H material properties to all regions of the model.
+
*CVM-H 15.1.0 - February 2015
−
*6.2 - August 2009 - This version of CVM-H includes modifications to top 300m material properties based on geotechnical information extracted from [[CVM-S]] as an interim approach to providing near surface geotechnical information into CVM-H material properties database.
+
**Added revisions to the basement surface that include the localization and displacements of faults in the Santa Maria Basin. This affects the boundary between the sediment and basement velocity parameterizations.
−
*6.1 - January 2009 - This version of CVM-H incorporates tomographic inversion results from Carl Tape et al.
+
*CVM-H 11.9.1 - December 2012
−
*5.3 - August 2008 - This is a version of CVM-H prior to integration of tomographic inversion results.
+
**tag: replaced about ten, seemingly random cells which were shallow in the basin and had a water tag with sediment and GTL tags (GTL tags are obsolete and can be considered equivalent to sediment tag).
 +
**vp63: replaced water velocity in retagged cells with average from surrounding cells
 +
**vs65: replaced all sediment tagged cells with values based on Vp using Brocher (2005). This resulted mostly in no change but fixed some cells (about 8) which were close to the southern edge and had no-data or negative values.
 +
*CVM-H 11.9.0 - September 2011
 +
** This release included the Santa Maria and San Bernardino basins, and changes to the Moho.
 +
*CVM-H 11.2.0 - February 2011
 +
** This is the prior release, and the first release of CVM-H that includes the Vs30-based geotechnical layer, the Hadley-Kanamori 1D background model, and the vx_lite depth-based query user interface. This version also introduces a date-based version numbering scheme (Year.Month.Revision).
 +
** CVM-H 11.2.0 contains a small code error. Only exceptionally advanced users, users that write their own C language software to query CVM-H through the vx_api interface, might encounter this bug. For nearly all standard usages, the code works as designed. Details about this known issue are described at the end of this entry. A workaround for this bug is available and is described in the users manual. This issue will be fixed in the next release. See a description below, and the the online user guide [[CVM-H User Guide]] for an example that employs the work-around.
 +
*CVM-H 6.3capi - November 2010
 +
**This is an interim version of CVM-H for use in testing and evaluation. This version includes an initial version of the vx_lite interface but does not provide the Vs30-based geotechnical layer. This version is distributed for completeness and we do not recommended its use by researchers.
 +
*CVM-H 6.3 - September 2010
 +
**This version CVM-H, released by the Harvard Structural Geology Group, removes all [[CVM-S]] geotechnical information and restores the original CVM-H material properties to all regions of the model.
 +
*CVM-H 6.2 - January 2010
 +
**This version of CVM-H includes modifications to top 300m material properties based on geotechnical information extracted from [[CVM-S]] as an interim approach to providing near surface geotechnical information into CVM-H material properties database.
 +
*CVM-H 6.0 - September 2009
 +
**This version of CVM-H incorporates tomographic inversion results from Carl Tape et al.
 +
*CVM-H 5.5 - September 2008
 +
**This is the last version of CVM-H prior to integration of tomographic inversion results.
 +
 
 +
The [[CVM-H User Guide]] contains a comprehensive version history for CVM-H that is more complete than this summary including scientific references for each version.
 +
 
 +
'''Please Note: These distributions are "old" version of CVM-H. We strongly recommend you use the latest version of CVM-H posted above. These versions are only distributed to support projects that used them in the past.'''
 +
 
 +
{| class="wikitable" border="1"
 +
|-
 +
! Platform
 +
! File
 +
! Download
 +
! Mirror
 +
! Notes
 +
|-
 +
| Linux
 +
| '''SCEC CVM-H 11.9.1 Source (550 Mb tar (tar.gz) file)'''
 +
| [http://hypocenter.usc.edu/research/cvmh/11.9.1/cvmh-11.9.1.tar.gz cvmh-11.9.1.tar.gz]
 +
|
 +
| Prior release
 +
|-
 +
| Linux
 +
| '''SCEC CVM-H 11.9.1 md5 (small text file)'''
 +
| [http://hypocenter.usc.edu/research/cvmh/11.9.1/cvmh-11.9.1.md5 cvmh-11.9.1.md5]
 +
|
 +
| Prior release
 +
|-
 +
| Linux
 +
| '''SCEC CVM-H 11.9.0 Source (529 Mb tar (tgz) file)'''
 +
| [http://hypocenter.usc.edu/research/cvmh/11.9.0/cvmh-11.9.0.tar.gz cvmh-11.9.0.tar.gz]
 +
| [http://earth.usc.edu/~patrices/mirror/cvmh/11.9.0/cvmh-11.9.0.tar.gz cvmh-11.9.0.tar.gz]
 +
| Prior release
 +
|-
 +
| Linux
 +
| '''SCEC CVM-H 11.9.0 md5 (small text file)'''
 +
| [http://hypocenter.usc.edu/research/cvmh/11.9.0/cvmh-11.9.0.tar.gz.md5 cvmh-11.9.0.tar.gz.md5]
 +
| [http://earth.usc.edu/~patrices/mirror/cvmh/11.9.0/cvmh-11.9.0.tar.gz.md5 cvmh-11.9.0.tar.gz.md5]
 +
| Prior release
 +
|-
 +
| Linux
 +
| '''SCEC CVM-H 11.2.0 Source (529 Mb tar (tgz) file)'''
 +
| [http://hypocenter.usc.edu/research/cvmh/11.2.0/cvmh_11.2.0.tgz cvmh_11.2.0.tgz]
 +
| [http://earth.usc.edu/~patrices/mirror/cvmh/11.2.0/cvmh_11.2.0.tgz cvmh_11.2.0.tgz]
 +
| Prior release
 +
|-
 +
| Linux
 +
| '''SCEC CVM-H 11.2.0 md5 (small text file)'''
 +
| [http://hypocenter.usc.edu/research/cvmh/11.2.0/cvmh_11.2.0.tgz.md5 cvmh_11.2.0.tgz.md5]
 +
| [http://earth.usc.edu/~patrices/mirror/cvmh/11.2.0/cvmh_11.2.0.tgz.md5 cvmh_11.2.0.tgz.md5]
 +
| Prior release
 +
|}
  
 
== Collaborators ==
 
== Collaborators ==
 
*[http://structure.harvard.edu/ Harvard Structural Geology and Earth Resources Group Home Page]
 
*[http://structure.harvard.edu/ Harvard Structural Geology and Earth Resources Group Home Page]
 
*[http://www.geology.sdsu.edu/ San Diego State University Dept of Geological Sciences]
 
*[http://www.geology.sdsu.edu/ San Diego State University Dept of Geological Sciences]
−
*[http://earth.usc.edu/~gely/ Geoff Ely Geotechnical Layer Implementation]
+
*[http://www-rcf.usc.edu/~pochen/ Po Chen Tomography]
 +
*[http://earth.usc.edu/~gely/vs30gtl/ Geoff Ely Geotechnical Layer Implementation]
 +
*[http://www.giseis.alaska.edu/input/carl/ Carl Tape Tomography]
 
*[http://earthquake.usgs.gov/regional/nca/3Dgeologic/documentation.php USGS CVM Web Site]
 
*[http://earthquake.usgs.gov/regional/nca/3Dgeologic/documentation.php USGS CVM Web Site]
 
*[http://earthquake.usgs.gov/regional/sca/ USGS Pasadena]
 
*[http://earthquake.usgs.gov/regional/sca/ USGS Pasadena]
−
*[http://www.giseis.alaska.edu/input/carl/ Carl Tape Tomography]
 
−
*[http://www-rcf.usc.edu/~pochen/ Po Chen Tomography]
 
 
*[http://www.scec.org SCEC]
 
*[http://www.scec.org SCEC]
 
*[http://scec.usc.edu/scecpedia SCEC/CME Project]
 
*[http://scec.usc.edu/scecpedia SCEC/CME Project]
  
 
== [[CVM Evaluation]] ==
 
== [[CVM Evaluation]] ==
−
We have introduced [[CVM Evaluation]] tests as part of the CVM-H release process. In our [[CVM Evaluation]] system, we use the latest version of CVM-H to build a velocity mesh for use in a 1Hz wave propagation simulation. We then run a wave propagation simulation using the each CVM mesh under evaluation, and we run goodness-of-fit measures that compare the simulation result against observation data (seismograms). The SCEC [[CVM Evaluation]] system is designed to compare simulation results for alternative CVM models.
+
We have introduced [[CVM Evaluation]] tests as part of the CVM-H release process. In our [[CVM Evaluation]] system, we evaluate CVM's using earthquake wave propagation simulations. For each CVM, we build a velocity mesh for use in a 1Hz wave propagation simulation. We then run a wave propagation simulation using the CVM mesh under evaluation, and we run goodness-of-fit measures that compare the simulation result against observation data (seismograms). The SCEC [[CVM Evaluation]] system is designed to compare simulation results for alternative CVM models.
  
 
== Alternative SCEC CVM's ==
 
== Alternative SCEC CVM's ==
−
As a part of the CVM-H release procedure, we are posting software version used to make the velocity meshes in our CVM evaluations. We are posting these version of the software so users can get the "as tested" version of the code.  
+
As a part of the CVM-H release procedure, we are posting the software versions used to make the velocity meshes in our CVM evaluations. We are posting these version of the software so users can get most recent, and best available, versions of SCEC CVM codes.
 +
 
 +
For the CVM-H 11.9.0 release, our CVM evaluation system was used to evaluate it in comparison with CVM-H 11.2.0.
 +
*CVM-H 15.1.0 - This is the current CVM-H. This version of CVM-H is posted in the download section of this web page.
 +
*CVM-H 11.9.0 - This is the previous CVM-H.
 +
*CVM-H 11.2.0 - This is an older CVM-H and we tested it using a newly implemented Vs30-based geotechnical layer. This version of CVM-H is posted in the download section of this web page. CVM-H 11.2 is based on CVM-H 6.3 with the following differences (1) Arbitrary precision and optional Vs30-based geotechnical layer added, (2) a 1D Hadley-Kanamori background model added to extend model region, and (3) New query interface supports query by depth in addition to query by elevation.
 +
 
 +
For the CVM-H 11.2.0 release, our CVM evaluation system was used to evaluate three different CVM's for southern California, the current release and two alternative, or earlier, SCEC CVM's.
 +
 
 +
*CVM-H 11.2 - This is the prior CVM-H and we tested it using a newly implemented Vs30-based geotechnical layer. This version of CVM-H is posted in the download section of this web page. CVM-H 11.2 is based on CVM-H 6.3 with the following differences (1) Arbitrary precision and optional Vs30-based geotechnical layer added, (2) a 1D Hadley-Kanamori background model added to extend model region, and (3) New query interface supports query by depth in addition to query by elevation.
 +
*[[CVM-H v6.3capi]] (CVM-H v63 model w/ vx_lite and C API, w/o any GTL):
 +
**This is the previous version of CVM-H. The material properties in this CVM-H 6.3 version are equivalent to the material properties in CVM-H 11.2, except for the geotechnical layer. In CVM-H 11.2, the geotechnical layer is optional, and without GTL, CVM-H 11.2 should produce material properties equivalent to this CVM-H 6.3 version. We believe CVM-H 6.3 version we are distributing is equivalent to the CVM-H 6.3 released through the Harvard Structural Geology Web site. We are posting this distribution because it contains software we developed to implement query by depth. All capabilities in CFM-H 6.3 have been implemented in CVM-H 11.2 and we recommend all users use CVM-H 11.2 or later.
 +
*[[CVM-S]] v4.1 (CVM-4 with Ely/Graves/Small mods):
 +
**This version of CVM-S4 includes fixes to all known software bugs in the 2005 distribution released through the SCEC data center, with additional modifications by Ely/Graves/Small to support querying with binary input files, and inclusion of an MPI query utility for large point sets, as well as a static library that allows the model to be queried programmatically. This is, to our knowledge, the best available version of CVM-S4.
 +
*[[CVM-S]] 4-gely (CVM-4 with Geoff Ely bug fixes):
 +
**This version of CVM-S4 includes fixes known bugs, such as un-initialized variables, in the original CVM-S distribution distributed through the SCEC Data Center. This is the version of CVM-S used in the CVM-H 11.2.0 [[CVM_Evaluation]]. If you want to work with [[CVM-S]], we recommend you use version [[CVM-S]] v4.1, posted above, as it contains additional changes and capabilities not in this version.
 +
 
 +
These distributions are available for download from the table below:
 +
 
 +
'''Please Note: These distributions are "old" version of CVM-S. We strongly recommend you use the latest version of CVM-S posted on the [[CVM-S]] page. These versions are only distributed to support projects that used them in the past.
 +
'''
 +
{| class="wikitable" border="1"
 +
|-
 +
! File
 +
! Download
 +
! Mirror
 +
|-
 +
| '''CVM-S v4.1'''
 +
|-
 +
| '''CVM-S v4.1 Source Code File (6.5 Mb tar (tgz) file)'''
 +
| [http://hypocenter.usc.edu/research/cvmtest/latest/cvms_v41.tgz cvms_v41.tgz]
 +
| [http://earth.usc.edu/~patrices/mirror/cvmtest/latest/cvms_v41.tgz cvms_v41.tgz]
 +
|-
 +
| '''CVM-S v4.1 Source Code md5sum File (small text file)'''
 +
| [http://hypocenter.usc.edu/research/cvmtest/latest/cvms_v41.tgz.md5 cvms_v41.tgz.md5]
 +
| [http://earth.usc.edu/~patrices/mirror/cvmtest/latest/cvms_v41.tgz.md5 cvms_v41.tgz.md5]
 +
|-
 +
| '''CVM-S 4-gely'''
 +
|-
 +
| '''CVM-S 4-gely Source Code File (6.5 Mb tar (tgz) file)'''
 +
| [http://hypocenter.usc.edu/research/cvmtest/11.1.0_RC/cvm4_gely_20101209.tar cvm4_gely_20101209.tar]
 +
| [http://earth.usc.edu/~patrices/mirror/cvmtest/11.1.0_RC/cvm4_gely_20101209.tar cvm4_gely_20101209.tar]
 +
|-
 +
| '''CVM-S 4-gely Source Code md5sum (small text file)'''
 +
| [http://hypocenter.usc.edu/research/cvmtest/11.1.0_RC/cvm4_gely_20101209.tar.md5 cvm4_gely_20101209.tar.md5]
 +
| [http://earth.usc.edu/~patrices/mirror/cvmtest/11.1.0_RC/cvm4_gely_20101209.tar.md5 cvm4_gely_20101209.tar.md5]
 +
|}
 +
 
 +
== Known Issue Description ==
  
−
For the CVM-H 11.2 release, our CVM evaluation system to evaluate three different CVM's for southern California, the current release and two alternative, or earlier, SCEC CVM's.
+
* CVM-H 11.2.0 is known to contain a small code error. Only advanced users might encounter this bug. For nearly all standard usages, the code works as designed.
−
*[[CVM-H]] 11.2 - This is the latest CVM-H and we tested it using a newly implemented Vs30-based geotechnical layer. CVM-H 11.2 is based on CVM-H 6.3 with the following differences:
+
 
−
**Vs30-based geotechnical layer added. GTL is arbitrary precision and optional.  
+
The vx_api library has a bug in query by depth mode. The structure member vx_entry_t.coord[2] (z value) gets altered during a vx_getcoord() call from depth to elevation when querying below the GTL. This value should not be changed during the call. The work-around for this issue is to make a copy of the depth value before the call to vx_getcoord() if you wish to use that depth later. The vx_lite command line tool does not exhibit this bug. This issue will be fixed in the next release. See the online user guide [[CVM-H User Guide]] for an example that employs the work-around.
−
**1D background model added to extend model region
 
−
**New query interface supports query by depth in addition to query by elevation.
 
−
*[[CVM-H v6.3capi]] (CVM-H v63 model w/ vx_lite and C API, w/o any GTL): [http://hypocenter.usc.edu/research/cvmtest/11.1.0_RC/cvmh_v63.tgz cvmh_v63.tgz]
 
−
**This is a previous version of CVM-H. The material properties in this version are equivalent to the material properties in the new version, except for the geotechnical layer. In the CVM-H 11.2 version, the geotechnical layer is optional, and without GTL, CVM-H 11.2 should produce material properties equivalent to this CVM-H 6.3 version. We believe CVM-H 6.3 version we are distributing is equivalent to the CVM-H 6.3 released through the Harvard Structural Geology Web site. We are posting this distribution because it contains software we developed to implement query by depth. The capabilities *CFM-H 6.3 have been implemented in CVM-H 11.2 and we recommend all users use CVM-H 11.2 or later.
 
−
*[[CVM-S]] (CVM-4 with Geoff Ely bug fixes): [http://hypocenter.usc.edu/research/cvmtest/11.1.0_RC/cvm4_gely_20101209.tar cvm4_gely_20101209.tar]
 
−
**This version of CVM-S4 includes fixes to all known software bugs in the 2005 distribution released through the SCEC data center. This is, to our knowledge, the best available version of CVM-S4.
 
  
 
== Development version ==
 
== Development version ==
Line 103: Line 257:
  
 
== Related Entries ==
 
== Related Entries ==
−
*[http://structure.harvard.edu/cvm-h/ Harvard CVM-H Web Page]
+
*[http://structure.harvard.edu/ Harvard Structural Geology and Earth Resources Web Page]
 +
*[http://structure.harvard.edu/projects/cvm-h Harvard Community Velocity Model]
 
*[[Goodness of Fit]]
 
*[[Goodness of Fit]]
 
*[[CVM-S]]
 
*[[CVM-S]]
Line 110: Line 265:
 
*[[CVM Evaluation]]
 
*[[CVM Evaluation]]
 
*[[Community Velocity Model]]
 
*[[Community Velocity Model]]
 +
*[[CVM-H User Guide]]
 +
*[[CVM Toolkit]]
 
*[[UCVM]]
 
*[[UCVM]]
 +
*[http://earth.usc.edu/~gely/vs30gtl/ Geotechnical Layer]
  
 
== See Also ==
 
== See Also ==
Line 118: Line 276:
  
 
== References ==
 
== References ==
 +
#'''Shaw, John H., Plesch, Andreas, Tape, Carl, Suess, M. Peter, Jordan, Thomas H., Ely, Geoffrey, Hauksson, Egill, Tromp, Jeroen, Tanimoto, Toshiro, Graves, Robert, Olsen, Kim, Nicholson, Craig, Maechling, Philip J., Rivero, Carlos, Lovely, Peter, Brankman, Charles M., Munster, Jason (2015) '''Unified Structural Representation of the southern California crust and upper mantle, Earth and Planetary Science Letters, V. 415, Num. 0, p.1-15, http://dx.doi.org/10.1016/j.epsl.2015.01.016
 
#'''Suess, M. P., and J. H. Shaw, 2003:''' P-wave seismic velocity structure derived from sonic logs and industry reflection data in the Los Angeles basin, California, Journal of Geophysical Research, 108/B3.
 
#'''Suess, M. P., and J. H. Shaw, 2003:''' P-wave seismic velocity structure derived from sonic logs and industry reflection data in the Los Angeles basin, California, Journal of Geophysical Research, 108/B3.
 
#'''Plesch, A., C. Tape, J. H. Shaw, and members of the USR working group, 2009, CVM-H 6.0:''' Inversion integration, the San Joaquin Valley and other advances in the community velocity model, in 2009 Southern California Earthquake Center Annual Meeting, Proceedings and Abstracts, vol. 19, pp. 260–261.  
 
#'''Plesch, A., C. Tape, J. H. Shaw, and members of the USR working group, 2009, CVM-H 6.0:''' Inversion integration, the San Joaquin Valley and other advances in the community velocity model, in 2009 Southern California Earthquake Center Annual Meeting, Proceedings and Abstracts, vol. 19, pp. 260–261.  
 
#'''Tape, C., Q. Liu, A. Maggi, and J. Tromp, 2009:''' Adjoint tomography of the southern California crust, Science, v. 325, p. 988-992.
 
#'''Tape, C., Q. Liu, A. Maggi, and J. Tromp, 2009:''' Adjoint tomography of the southern California crust, Science, v. 325, p. 988-992.
 
#''' Ely, G., 2010:''' [http://earth.usc.edu/~gely/cvmh/ Vs30 Derived GTL]
 
#''' Ely, G., 2010:''' [http://earth.usc.edu/~gely/cvmh/ Vs30 Derived GTL]

Latest revision as of 17:44, 5 November 2019

The SCEC Community Velocity Model - Harvard (CVM-H) is a velocity model of crust and upper mantle structure in southern California developed by the SCEC community for use in fault systems analysis, strong ground motion prediction, and earthquake hazards assessment.

Perspective view of the northern part of CVM-H v15.1.0, showing an enlarged transect across the Los Angeles basin. An enlarged view of the shallow velocity structure in the basin shows the Geotechnical Layer (GTL), as described in the text. B) Cross sections showing Vp across the USR. LA is Los Angeles basin; SB is Santa Barbara basin; IB is Inner Borderland; ST is Salton Trough basin (Shaw et al., 2015)

Overview

The latest version of the SCEC Community Velocity Model (CVM-H 15.1.0) includes basin structures embedded in the 3D waveform inversion model of Tape et al. (2009), and an explicit representation of the Moho (after Yan and Clayton, 2007; Chulick and Mooney, 2002), and an optional arbitrary-precision Vs30-derived geotechnical layer for the top 350m (Ely et al 2011).

The SCEC CVM-H velocity model describes seismic P- and S-wave velocities and densities, and is comprised of basin structures embedded in tomographic and teleseismic crust and upper mantle models. This latest release of the CVM-H (15.1.0) represents the integration of various model components, including fully 3D waveform tomographic results. We recommend use of the most recent version of CVM-H, in most cases.

Improvements in version 15.1.0 include revisions to the basement surface that include the localization and displacements of faults in the Santa Maria Basin. This affects the boundary between the sediment and basement velocity parameterizations.

Previous improvements that appeared in version 11.9, and also appear in 15.1.0, include a newly compiled Moho surface, opening up the offshore Santa Maria basin to the western model margin, a detailed representation of the San Bernardino basin, a much smoother transition between low resolution area and high resolution area at its southern border in the Los Angeles region and removal of various small near surface artifacts. The new Moho surface was compiled by Tape et al. from a large number of data sources, including global data sets, receiver functions and local studies. In replacing this surface care was taken that the depth interval around the Moho level both in the mantle and in the crustal portions of the model which were affected by this change, were assigned the correct domain, and consequently assigned velocities extrapolated from the underlying mantle model or from the crustal background model. In the offshore Santa Maria basin we extended the definition of the basement surface using reflection seismic data (McIntosh et al., 1991) to the very western margin of the model and to the north in order to remove an abrupt transition from the basin to background. We smoothly extrapolated sediment velocities from the onshore model into this new basinal area. Another basin, the relatively small San Bernardino basin, is now represented in the model. The basement surface is based on gravity data (Anderson, 2000) and seismic reflection data (Stephenson et al., 2004). To the west the basin is connected by a thin veneer of sediments to the Los Angeles basin whereas to the ESE the basin is represented as tapering out as is the case in other such basin representation. The ESE is the deepest part of the basin, and the data do not preclude a continuation of the basin in this direction. The Vp velocity structure in the basin is defined by stacking velocities (Stephenson et al., 2004) and a 1D velocity profile (Graves, 2004). Vs is derived from Vp using Brocher (2004). Finally, we removed a discontinuity in the velocity structure between the southern margin of the high resolution model in the Los Angeles area and the surrounding low resolution model. We modified the high resolution area by introducing a smooth N-S gradient in the delta between the low and high resolution models in a region at its southern margin.

The CVM-H 15.1.0 consists of basin structures defined using high-quality industry seismic reflection profiles and tens of thousands of direct velocity measurements from boreholes (Plesch et al., 2009; Süss and Shaw, 2003). The basin structures are also compatible with the locations and displacements of major faults represented in the SCEC Community Fault Model (CFM) (Plesch et al., 2007). These basin structures were used to develop travel time tomographic models of the crust (after Hauksson, 2000) extending to a depth of 35 km, and upper mantle teleseismic and surface wave models extending to a depth of 300 km (Prindle and Tanimoto, 2006). These various model components were integrated and used to perform a series of 3D adjoint tomographic inversions that highlight areas of the model that were responsible for mismatches between observed and synthetic waveforms (Tape et al, 2009). Sixteen tomographic iterations, requiring 6800 wavefield simulations, yielded perturbations to the starting model that have been incorporated in the latest model release. CVM-H 15.1.0 also incorporates a new Moho surface (Yan and Clayton, 2007) and an upgraded geotechnical layer (GTL) based on a Vs30 map (Ely 2010), the Vp-density scaling relationship, and the code that delivers the model.

Current Release

SCEC CVM-H version 15.1.0 was released on Wednesday 11 February 2015.

Version 15.1.0 includes revisions to the basement surface that include the localization and displacements of faults in the on-shore Santa Maria Basin. This affects the boundary between the sediment and basement velocity parameterizations.

Version 11.9.1 represents an improvement on 11.9.0 and it is recommended that all users upgrade to this new version. Specifically, the latest iteration includes the following changes to the high resolution (HR) data set:

  • replaced about ten, seemingly random cells which were shallow in the basin and had a water tag with sediment and GTL tags (GTL tags are obsolete and can be considered equivalent to sediment tag)
  • vp63: replaced water velocity in retagged cells with average from surrounding cells
  • vs65: replaced all sediment tagged cells with values based on Vp using Brocher (2005). This resulted mostly in no change but fixed some cells (about 8) which were close to the southern edge and had no-data or negative values

Known Issues

CVM-H 15.1.0:

  • None at this time.

Dependencies

The following software is required to build and run CVM-H.

  • UNIX operating system (tested on Linux and SunOS, untested on Solaris and MacOS)
  • GNU make
  • tar for opening the compressed files
  • GNU C compiler for building the executable program.
  • Optionally GTS (GNU Triangulated Surface Library) for cvmdist http://gts.sourceforge.net
  • Optionally GMT (Generic Mapping Tools) to generate plots from vx_slice http://www.soest.hawaii.edu/gmt/

Documentation

User Guide Wiki (includes installation instructions):

Downloads

To install and use the CVM-H, you need to download and build the CVM-H software distribution. There are detailed installation instructions on the CVM-H User Guide. The main steps involved in installing CVM-H include:

  1. The software can be installed in an account on a Linux computer with at least 600MB of disk storage and GNU C compiler and GNU compliant make.
  2. From the Linux computer, start a web browser and point to this download page. Alternatively, you can retrieve the files with SFTP or other retrieval software.
  3. Download the two CVM-H files (CVM-H source, CVM-H md5sum) into a directory and run the md5sum program to confirm you have an undamaged version of the distribution files.
  4. Uncompress the distribution (tar.gz) files into a local directory on your computer.
  5. Configure the installer by running the ./configure script.
  6. Build the executables by running the top level makefile ('make').
  7. Confirm the code is built correctly by running the unit/acceptance tests ('make check').
  8. Install the executables ('make install').
  9. Use CVM-H for research purposes.

Please note that, depending on your version of Linux or OS X, some additional steps may be required. If you run into the following error:

configure: error: cannot find install-sh, install.sh, or shtool in ./aux-config "."/./aux-config

Then please follow these steps:

  1. Install automake. On Ubuntu this is sudo apt install automake. On Linux systems with Yum, the command is yum install automake.
  2. Run aclocal
  3. Run automake --force-missing --add-missing
  4. Run autoconf
  5. Run ./configure --prefix=/path/to/install/cvmh
  6. Run make, make check, and make install
Platform File Download Mirror Notes
Linux SCEC CVM-H 15.1.1 Source (532 MB tar (tar.gz) file) cvmh-15.1.1.tar.gz Latest official release
Linux SCEC CVM-H 15.1.1 md5 (small text file) cvmh-15.1.1.tar.gz.md5 Latest official release

Supporting Materials

These posters and presentations may contain information about earlier versions of CVM-H. This information may be useful to some users.

Help

For assistance with the SCEC CVM-H, you may:

  • Browse and submit new tickets at CVM-H Trac
  • Email software (at) scec.org with specific questions
  • Subscribe to email list cvm-h-all (at) intensity.usc.edu to receive announcements about new version of the software.

Software License

CVM-H software distributions are released under an Apache 2.0 open-source license as described here CVM-H License.

Release History

The CVM-H releases contain cumulative improvements to the geological models and software interfaces. We recommend using the most recent version of the software, in most cases.

  • CVM-H 15.1.0 - February 2015
    • Added revisions to the basement surface that include the localization and displacements of faults in the Santa Maria Basin. This affects the boundary between the sediment and basement velocity parameterizations.
  • CVM-H 11.9.1 - December 2012
    • tag: replaced about ten, seemingly random cells which were shallow in the basin and had a water tag with sediment and GTL tags (GTL tags are obsolete and can be considered equivalent to sediment tag).
    • vp63: replaced water velocity in retagged cells with average from surrounding cells
    • vs65: replaced all sediment tagged cells with values based on Vp using Brocher (2005). This resulted mostly in no change but fixed some cells (about 8) which were close to the southern edge and had no-data or negative values.
  • CVM-H 11.9.0 - September 2011
    • This release included the Santa Maria and San Bernardino basins, and changes to the Moho.
  • CVM-H 11.2.0 - February 2011
    • This is the prior release, and the first release of CVM-H that includes the Vs30-based geotechnical layer, the Hadley-Kanamori 1D background model, and the vx_lite depth-based query user interface. This version also introduces a date-based version numbering scheme (Year.Month.Revision).
    • CVM-H 11.2.0 contains a small code error. Only exceptionally advanced users, users that write their own C language software to query CVM-H through the vx_api interface, might encounter this bug. For nearly all standard usages, the code works as designed. Details about this known issue are described at the end of this entry. A workaround for this bug is available and is described in the users manual. This issue will be fixed in the next release. See a description below, and the the online user guide CVM-H User Guide for an example that employs the work-around.
  • CVM-H 6.3capi - November 2010
    • This is an interim version of CVM-H for use in testing and evaluation. This version includes an initial version of the vx_lite interface but does not provide the Vs30-based geotechnical layer. This version is distributed for completeness and we do not recommended its use by researchers.
  • CVM-H 6.3 - September 2010
    • This version CVM-H, released by the Harvard Structural Geology Group, removes all CVM-S geotechnical information and restores the original CVM-H material properties to all regions of the model.
  • CVM-H 6.2 - January 2010
    • This version of CVM-H includes modifications to top 300m material properties based on geotechnical information extracted from CVM-S as an interim approach to providing near surface geotechnical information into CVM-H material properties database.
  • CVM-H 6.0 - September 2009
    • This version of CVM-H incorporates tomographic inversion results from Carl Tape et al.
  • CVM-H 5.5 - September 2008
    • This is the last version of CVM-H prior to integration of tomographic inversion results.

The CVM-H User Guide contains a comprehensive version history for CVM-H that is more complete than this summary including scientific references for each version.

Please Note: These distributions are "old" version of CVM-H. We strongly recommend you use the latest version of CVM-H posted above. These versions are only distributed to support projects that used them in the past.

Platform File Download Mirror Notes
Linux SCEC CVM-H 11.9.1 Source (550 Mb tar (tar.gz) file) cvmh-11.9.1.tar.gz Prior release
Linux SCEC CVM-H 11.9.1 md5 (small text file) cvmh-11.9.1.md5 Prior release
Linux SCEC CVM-H 11.9.0 Source (529 Mb tar (tgz) file) cvmh-11.9.0.tar.gz cvmh-11.9.0.tar.gz Prior release
Linux SCEC CVM-H 11.9.0 md5 (small text file) cvmh-11.9.0.tar.gz.md5 cvmh-11.9.0.tar.gz.md5 Prior release
Linux SCEC CVM-H 11.2.0 Source (529 Mb tar (tgz) file) cvmh_11.2.0.tgz cvmh_11.2.0.tgz Prior release
Linux SCEC CVM-H 11.2.0 md5 (small text file) cvmh_11.2.0.tgz.md5 cvmh_11.2.0.tgz.md5 Prior release

Collaborators

CVM Evaluation

We have introduced CVM Evaluation tests as part of the CVM-H release process. In our CVM Evaluation system, we evaluate CVM's using earthquake wave propagation simulations. For each CVM, we build a velocity mesh for use in a 1Hz wave propagation simulation. We then run a wave propagation simulation using the CVM mesh under evaluation, and we run goodness-of-fit measures that compare the simulation result against observation data (seismograms). The SCEC CVM Evaluation system is designed to compare simulation results for alternative CVM models.

Alternative SCEC CVM's

As a part of the CVM-H release procedure, we are posting the software versions used to make the velocity meshes in our CVM evaluations. We are posting these version of the software so users can get most recent, and best available, versions of SCEC CVM codes.

For the CVM-H 11.9.0 release, our CVM evaluation system was used to evaluate it in comparison with CVM-H 11.2.0.

  • CVM-H 15.1.0 - This is the current CVM-H. This version of CVM-H is posted in the download section of this web page.
  • CVM-H 11.9.0 - This is the previous CVM-H.
  • CVM-H 11.2.0 - This is an older CVM-H and we tested it using a newly implemented Vs30-based geotechnical layer. This version of CVM-H is posted in the download section of this web page. CVM-H 11.2 is based on CVM-H 6.3 with the following differences (1) Arbitrary precision and optional Vs30-based geotechnical layer added, (2) a 1D Hadley-Kanamori background model added to extend model region, and (3) New query interface supports query by depth in addition to query by elevation.

For the CVM-H 11.2.0 release, our CVM evaluation system was used to evaluate three different CVM's for southern California, the current release and two alternative, or earlier, SCEC CVM's.

  • CVM-H 11.2 - This is the prior CVM-H and we tested it using a newly implemented Vs30-based geotechnical layer. This version of CVM-H is posted in the download section of this web page. CVM-H 11.2 is based on CVM-H 6.3 with the following differences (1) Arbitrary precision and optional Vs30-based geotechnical layer added, (2) a 1D Hadley-Kanamori background model added to extend model region, and (3) New query interface supports query by depth in addition to query by elevation.
  • CVM-H v6.3capi (CVM-H v63 model w/ vx_lite and C API, w/o any GTL):
    • This is the previous version of CVM-H. The material properties in this CVM-H 6.3 version are equivalent to the material properties in CVM-H 11.2, except for the geotechnical layer. In CVM-H 11.2, the geotechnical layer is optional, and without GTL, CVM-H 11.2 should produce material properties equivalent to this CVM-H 6.3 version. We believe CVM-H 6.3 version we are distributing is equivalent to the CVM-H 6.3 released through the Harvard Structural Geology Web site. We are posting this distribution because it contains software we developed to implement query by depth. All capabilities in CFM-H 6.3 have been implemented in CVM-H 11.2 and we recommend all users use CVM-H 11.2 or later.
  • CVM-S v4.1 (CVM-4 with Ely/Graves/Small mods):
    • This version of CVM-S4 includes fixes to all known software bugs in the 2005 distribution released through the SCEC data center, with additional modifications by Ely/Graves/Small to support querying with binary input files, and inclusion of an MPI query utility for large point sets, as well as a static library that allows the model to be queried programmatically. This is, to our knowledge, the best available version of CVM-S4.
  • CVM-S 4-gely (CVM-4 with Geoff Ely bug fixes):
    • This version of CVM-S4 includes fixes known bugs, such as un-initialized variables, in the original CVM-S distribution distributed through the SCEC Data Center. This is the version of CVM-S used in the CVM-H 11.2.0 CVM_Evaluation. If you want to work with CVM-S, we recommend you use version CVM-S v4.1, posted above, as it contains additional changes and capabilities not in this version.

These distributions are available for download from the table below:

Please Note: These distributions are "old" version of CVM-S. We strongly recommend you use the latest version of CVM-S posted on the CVM-S page. These versions are only distributed to support projects that used them in the past.

File Download Mirror
CVM-S v4.1
CVM-S v4.1 Source Code File (6.5 Mb tar (tgz) file) cvms_v41.tgz cvms_v41.tgz
CVM-S v4.1 Source Code md5sum File (small text file) cvms_v41.tgz.md5 cvms_v41.tgz.md5
CVM-S 4-gely
CVM-S 4-gely Source Code File (6.5 Mb tar (tgz) file) cvm4_gely_20101209.tar cvm4_gely_20101209.tar
CVM-S 4-gely Source Code md5sum (small text file) cvm4_gely_20101209.tar.md5 cvm4_gely_20101209.tar.md5

Known Issue Description

  • CVM-H 11.2.0 is known to contain a small code error. Only advanced users might encounter this bug. For nearly all standard usages, the code works as designed.

The vx_api library has a bug in query by depth mode. The structure member vx_entry_t.coord[2] (z value) gets altered during a vx_getcoord() call from depth to elevation when querying below the GTL. This value should not be changed during the call. The work-around for this issue is to make a copy of the depth value before the call to vx_getcoord() if you wish to use that depth later. The vx_lite command line tool does not exhibit this bug. This issue will be fixed in the next release. See the online user guide CVM-H User Guide for an example that employs the work-around.

Development version

If you're interested in working with the latest development version of the platform, you can check it out from: 

svn co https://source.usc.edu/svn/cvmh/trunk

Details about working with the development version are provided in the User Guide.

Related Entries

See Also

References

  1. Shaw, John H., Plesch, Andreas, Tape, Carl, Suess, M. Peter, Jordan, Thomas H., Ely, Geoffrey, Hauksson, Egill, Tromp, Jeroen, Tanimoto, Toshiro, Graves, Robert, Olsen, Kim, Nicholson, Craig, Maechling, Philip J., Rivero, Carlos, Lovely, Peter, Brankman, Charles M., Munster, Jason (2015) Unified Structural Representation of the southern California crust and upper mantle, Earth and Planetary Science Letters, V. 415, Num. 0, p.1-15, http://dx.doi.org/10.1016/j.epsl.2015.01.016
  2. Suess, M. P., and J. H. Shaw, 2003: P-wave seismic velocity structure derived from sonic logs and industry reflection data in the Los Angeles basin, California, Journal of Geophysical Research, 108/B3.
  3. Plesch, A., C. Tape, J. H. Shaw, and members of the USR working group, 2009, CVM-H 6.0: Inversion integration, the San Joaquin Valley and other advances in the community velocity model, in 2009 Southern California Earthquake Center Annual Meeting, Proceedings and Abstracts, vol. 19, pp. 260–261.
  4. Tape, C., Q. Liu, A. Maggi, and J. Tromp, 2009: Adjoint tomography of the southern California crust, Science, v. 325, p. 988-992.
  5. Ely, G., 2010: Vs30 Derived GTL
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