Software
The Southern California Earthquake Center develops, maintains, and supports a number of scientific software programs. This is the software download page for SCEC-supported software distributions. SCEC provides varying levels of support for scientific software packages. We describe the level of support for each software package using the Computational Infrastructure in Geodynamics (CIG) software support levels. In order, from greatest to least, our software support levels are (1) Developed, maintained, and supported (2) Maintained and supported (3) Accepting bug reports.
Contents
Broadband Platform
The goal of the SCEC Broadband Simulation Platform is to generate ground motions for a particular earthquake scenario using deterministic low-frequency and stochastic high-frequency simulations. It provides multiple approaches for generating the rupture description, modeling high- and low-frequency wave propagation, and incorporating site amplification effects. These codes have been validated against recorded ground motions from real events, to increase confidence in their results. With the Broadband Platform, a user can select which combination of approaches to use and simulate an earthquake, producing seismograms which include high and low frequency data. Ultimately these seismograms can be used to improve ground motion attenuation models, resulting in more accurate predictions of future ground motions for building engineers.
- Support Level: Developed, maintained, and supported.
CVM-H
The 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 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.
- Support Level: Developed, maintained, and supported.
CVM-S
CVM-S is the original 3D Velocity Model for Southern California developed by SCEC between 1991 and 2005. Several versions of this original SCEC CVM have been released through the SCEC Data Center including CVM 2.0, CVM-S 3.0 and CVM-4.
During the 2005 SCEC-3 proposal process, this original SCEC CVM was renamed to CVM-S in order to distinguish it from the alternative southern California CVM Harvard (CVM-H developed by John Shaw, Andreas Plesch and others.
CVM-S should be of interest to ground motion modeling groups. Also, the southern California geologic community should find the basin models in CVM-S useful because they are based on structures and interfaces that are largely derived from geologic structure models. The deeper sediment velocities themselves are obtained from empirical relationships that take into account age of the formation and depth of burial. The coefficients of these relationships are calibrated to sonic logs taken from boreholes in the region. Shallow sediment velocities are taken from geotechnical borehole measurements. Hardrock velocities are based on tomographic studies.
- Support Level: Accepting bug reports.
