UCVM 14.3.0 User Guide

Overview

Released on March 31, 2014, UCVM 14.3.0 represents the third major release of the Unified Community Velocity Model (UCVM) framework. UCVM is a collection of software utilities that are designed to make querying velocity models, building meshes, and visualizing velocity models easier to do through a uniform software interface. UCVM has been used extensively to generate meshes and e-trees that are then used for 3D wave propagation simulations within California.

The full feature list is as follows:

• Seamlessly combine two or more models into a composite model for querying
• Optionally include a California statewide geotechnical layer and interpolate it with the crustal velocity models
• Extract a 3D mesh or CVM Etree (octree) of material properties from any combination of models
• Standard California statewide elevation and Vs30 data map is provided
• Miscellaneous tools are provided for creating 2D etree maps, and optimizing etrees
• Numerically smooth discontinuities at the interfaces between different regional models
• Add support for future velocity models with the extendable interface
• Add small-scale heterogeneities to meshes
• Visualize cross-sections, horizontal slices, Z1.0, Z2.5, and Vs30 maps
• Query for Z1.0 and Z2.5 values

Currently, we support CVM-S4, CVM-H 11.9.1, CVM-S4.26, CenCal 0.8.0, Broadband Whittier Narrows 1D model, and the Hadley-Kanamori 1D model as part of our automated installation package. Other models, such as SCEC CVM-NCI, Magistrale WFCVM, Graves Cape Mendocino, Lin-Thurber Statewide, and Tape SoCal are supported, however they will require a manual installation. We have also tested and include support for three major high-performance computing resources: NICS Kraken, TACC Stampede, and NCSA Blue Waters. It should work with other HPC machines as well.

The API itself is written entirely in C. We will show how to query UCVM through both C and Fortran in this user guide. The visualization scripts are written in Python, and can be easily called from the command line as part of an automated workflow.

Finally, UCVM requires either Linux or OS X, GCC 4.3+, Python 2.5+, and an active internet connection to download and retrieve the models. For parallel mesh or e-tree extraction, the MPI libraries are also required.

Four Linux systems are officially supported:

• Ubuntu 13.10
• Debian 7
• CentOS 6.5
• Red Hat Enterprise Linux 6.5

Other systems, while not officially supported, should still work.

If you are installing UCVM on OS X, you must have the OS X Developer Tools (Xcode and Command Line Tools) and you must also have gfortran installed.