CyberShake Rupture Files

CyberShake uses rupture files to provide descriptions of rupture geometry, and, in some cases, slip information about individual events to be simulated. A description of these files is below.

UCERF2 files

To date, all CyberShake simulations have been performed using UCERF 2 events. These events can include both a rupture geometry file and a Standard Rupture Format (SRF) description of the event itself.

UCERF2 Rupture Geometry Files

Rupture geometry files contain a list of all the points which appear on the surface of the rupture. This information is needed to determine which SGTs should be saved (so that we have an SGT for each point on every rupture surface), and to generate a rupture variation when passed into the RupGen-api code. We can also use the rupture geometry to generate the list of points we need SGTs for when doing post-processing. Since 2014, we have tried to replace the SRF with the rupture geometry whenever possible, as it is a much smaller file and therefore reduces I/O.

The format of the rupture geometry files is:

Probability = <prob>
Magnitude = <mag>
GridSpacing = <spacing between elements, in km>
NumRows = <# rows>
NumCols = <# cols>
#   Lat         Lon         Depth      Rake    Dip     Strike


...


...

A 'row' is defined as a set of rupture points all at the same depth, and rows are listed in the file from shallowest to deepest.

For ERF 35, we used 1 km spacing; this should be used with 0.5 Hz simulations. For ERF 36, we used 200 m spacing; this should be used with 1 Hz simulations.

These files are stored in <CyberShake root>/ruptures/Ruptures_erf<ERF ID>/<src ID>/<rup ID>/<src>_<rup>.txt. The path to the top-level ruptures directory is specified in cybershake.cfg, and the substructure is assumed in the PreSgt code.

The geometry files for ERF 35 and ERF 36 are available here: ERF 35(127 MB) and here: ERF 36(3.9 GB)

Rupture Variation files

Initially, we precomputed rupture variations for all events and saved these to disk. This was done for the Graves & Pitarka (2006) (Rupture Variation Scenario ID 3) and Graves & Pitarka (2010) (Rup Var Scenario ID 4). The