Broadband Platform v11.2.3

Fig 1: Broadband Platform.

The SCEC Broadband Platform is a software system which generates 0-10 Hz seismograms for historical and scenario earthquakes in California.

Overview

The goal of the SCEC Broadband Simulation Platform is to generate broadband (0-10 Hz) ground motions for earthquakes using deterministic low-frequency and stochastic high-frequency simulations. The SCEC Broadband Platform is a collaborative software development project involving SCEC researchers, graduate students, and the SCEC/CME software development group. SCEC scientific groups have contributed modules to the Broadband Platform including rupture generation, low-frequency deterministic seismogram synthesis, high-frequency stochastic seismogram synthesis, and non-linear site effects. These complex scientific codes have been integrated into a system that supports easy on-demand computation of broadband seismograms. The SCEC Broadband Platform is designed to be used by both scientific and engineering researchers with some experience interpreting ground motion simulations.

Users may calculate broadband seismograms for both historical earthquakes (validation events including Northridge, Loma Prieta, and Landers) and user-defined earthquakes. The platform produces a variety of data products, including broadband seismograms, rupture visualizations, and goodness-of-fit plots. Users can install the platform on their own machine, verify that it is installed correctly, and run their own simulations on demand without requiring knowledge of any of the code involved. Users may run a validation event, supply their own simple source description, or provide a rupture description in SRF format. Users may specify their own list of stations or use a provided list. Currently the platform supports stations and events in Southern California, the Bay Area, and the Mojave. Users may select among various codebases for rupture generation, low-frequency synthesis, high-frequency synthesis, and incorporation of site effects, with the option of running a goodness-of-fit comparison against observed or simulated seismograms. These codes have been validated against recorded ground motions from real events.

The Broadband Platform was implemented using software development best practices, including version control, user documentation, acceptance tests, and formal releases, with the aim of ease of installation and use.

Current Release

The current official release of Broadband Platform is v11.2.2. This distribution was posted online on Thursday, 14 Oct 2011. This is a "bug-fix" version of the platform that fixes a small number of bugs discovered in v11.2.1. since its release in September 2011.

We recommend current Broadband platform users migrate to this new version at first opportunity. No significant functional changes are introduced in this version of the platform.

Dependencies

Broadband has the following dependencies:

• Python 2.5+ with
  • NumPy
  • matplotlib
• Intel compilers

A non-commercial copy of Intel c and FORTRAN compilers can be obtained by registering for a non-commercial account with Intel and downloading the compilers from the Intel website.

and the following optional dependencies for additional functionality:

• GMT (for plotting)
• Matlab with map toolbox (for certain platform modules)
• PyGTK (for interactive plotting)

Documentation

User Guide Wiki (includes installation instructions):

• Broadband_User_Guide_v11.2

Downloads

To install and use the Broadband platform, you need both the source code and the data files. The broadband platform contains cumulative improvements to the geoscientific codes and software infrastructure. We recommend use of the most recent version of the broadband platform, in most cases.

Users that are upgrading from V11.2.0 to v11.2.1 should retrieve new versions of both the Broadband Platform data files and the Broadband Platform source code. Both were changed in this latest release.

There are detailed installation instructions in the Broadband User Guide v11.2.

The main steps involved in installing the platform as a local installation on Linux machine include:

1. The software can be installed in an account on a Linux computer with at least 4GB of disk storage and C, Fortran, and Python software installed.
2. 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.
3. Download the following four files (source, source md5sum, data, data md5sum) into a directory and run the md5sum program to confirm you have an undamaged version of the distribution files.
4. Uncompress the distribution (tgz) files into data and source directory structures. The data files are nearly 3GB, but they are static and will not be modified and will not grow in size during use of the platform. The source directory is small, but this directory will increase as the platform is used, since the results produced by the platform will be stored here.
5. Configure your environment to add broadband platform directories into your python path and define other useful environment variables.
6. Build the executables by running the top level makefile.
7. Confirm the code is built correctly by running UnitTests.
8. Confirm the code runs correctly on your system by running AcceptanceTests.
9. Use the platform for research purposes.

Current Broadband Platform Release

The current SCEC Broadband platform release is v11.2.2. Links to the source code and data distributions are listed in the table below:

Version	Release Date	Files		User Guide
		Source Code	Data
11.2.2	09/29/2011	bbp_dist_v11.2.2.tgz bbp_dist_v11.2.2.tgz.md5	bbp_data_v11.2.2.tgz bbp_data_v11.2.2.tgz.md5	Broadband User Guide v11.2.2 Broadband v11.2.2 Release Notes

Previous Broadband Platform Release

Earlier version of the broadband platform software and data distributions are provided to support existing Broadband platform users. However, we recommend all users upgrade to the most recent version at first opportunity.

Version	Release Date	Files		User Guide
		Source Code	Data
11.2.1	09/29/2011	bbp_dist_v11.2.1.tgz bbp_dist_v11.2.1.tgz.md5	bbp_data_v11.2.1.tgz bbp_data_v11.2.1.tgz.md5	Broadband User Guide v11.2.1 Broadband v11.2.1 Release Notes
11.2.0	02/18/2011	bbp_dist_v11.2.0.tgz bbp_dist_v11.2.0.tgz.md5	bbp_data_v11.2.0.tgz bbp_data_v11.2.0.tgz.md5	Broadband User Guide v11.2

Supporting Materials

• Broadband Platform Presentation - SSA 2011 - Robert Graves (5MB pptx file)
• Broadband poster from AGU 2010 (PDF, 882 KB)
• Broadband overview talk from SC10 (PPT, 3.7 MB)
• Technical diagrams of Broadband module relationships (PPTX, 16 KB)

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/broadband/trunk

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

The next version of Broadband, v 11.7, is expected to be released in Q4 of 2011. Additional details about this version is available here:

• Broadband Development Version

Help

For assistance with the Broadband Platform, you may

• Email software @ scec.org with specific questions
• Browse and submit new trouble tickets, or feature requests, at Broadband Trac site. SCEC user login is required to submit trouble tickets this way.

License

SCEC Broadband Platform software distributions are released under an Apache 2.0 open-source license as described here Broadband License.

Changes in Broadband Platform v11.2.1

Broadband Platform v11.2.1, releases in September 2011 is considered a 'bug-fix' release of Broadband Platform. Broadband Platform v11.2.1 contains the same functional capabilities as v11.2.0 with the following modifications.

List of Trac items fixed in this release:

• Trac # 41 - Add License file (EULA) to Broadband distribution.
• Trac # 42 - Add a file manifest to the distribution archives.
• Trac # 46 - Remove Hardcoded Green_Bank.inf entries.
• Trac # 47 - Syn1d Module fails with IO error due to missing file.
• Trac # 54 - plot_SRF.csh fails with "Newline in variable name".
• Trac # 61 - Provide an option to remove temporary folders at end of Broadband simulation run.
• Trac # 62 - Add a warning and user prompt to comps/cleanup.py script.
• Trac # 63 - Acceptance resume.txt should not be created in ref_data/accept_inputs.
• Trac # 64 - Simulations with URS HF module fail with IOError and segmentation faults.
• Trac # 65 - Add the XML file generated during a Broadband simulation to the output directory as metadata.

11.2.0 - February 2011 - Initial release.

Collaborators

• ETH Zurich - Swiss Federal Institute of Technology Zurich
• San Diego State University Dept of Geological Sciences
• U.C. Santa Barbara Dept of Earth Sciences
• UCSB Institute for Crustal Studies
• URS Corporation
• SCEC
• SCEC/CME Project

See Also

• Broadband Platform 2007
• SCEC Software Downloads
• SCEC Wiki Main
• SCEC Home Page

References

1. Graves, R. W. and A. Pitarka (2010). “Broadband Ground-Motion Simulation Using a Hybrid Approach.” Bull. Seis. Soc. Am., 100(5A), pp. 2095-2123, doi: 10.1785/0120100057. link
2. Mai, P.M., W. Imperatori, and K.B. Olsen (2010). “Hybrid broadband ground motion simulations: combining long-period deterministic synthetics with high frequency multiple S-to-S back-scattering.” Bull. Seis. Soc. Am., 100(5A), pp. 2124-2142, doi: 10.1785/0120080194. link
3. Schmedes, J., R. J. Archuleta, and D. Lavallée (2010). “Correlation of earthquake source parameters inferred from dynamic rupture simulations.” J. Geophys. Res., 115, B03304, doi:10.1029/2009JB006689. link