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- https://strike.scec.org/scecpedia/Standard_Rupture_Format
- SRF-Description-Graves_2.0.pdf
- SRF File Format Version 1 (output of genslip): srf_description_version_1.pdf
- Details on Source Modelling : Source Modelling for GMSim
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| Code Block |
|---|
identifier, rupture, type, date, version |
GSF File
The GSF file is used to define the geometry of a source in a source modelling problem. It is the first step in the SRF generation process after a realisation is read.
A GSF file contains three sections in order:
- Errata/Header section,
- Declaration of the number of points (N),
- The geometry description: N lines representing each point in the geometry.
There are utilities to read GSF files in the gsf module within qcore.
Errata/Header
The header consists of a number of commented lines, each beginning with # . Here is an example:
| Code Block |
|---|
# nstk= 179 ndip= 215
# flen= 17.0720 fwid= 21.2853
# LON LAT DEP(km) SUB_DX SUB_DY LOC_STK LOC_DIP LOC_RAKE SLIP(cm) INIT_TIME SEG_NO |
This is the typical output of fault_seg2gsf . The first line has the number of points in the strike and dip directions, respectively. Then the length and width of the fault, and the last line is a description of each column in the points section.
The header is skipped by programs parsing GSF files and may contain any number of lines. The Python GSF generator, for example, only prints out the column description.
| Code Block |
|---|
# LON LAT DEP(km) SUB_DX SUB_DY LOC_STK LOC_DIP LOC_RAKE SLIP(cm) INIT_TIME SEG_NO |
Declaration of the Number of Points
Immediately following the header, there is one line containing the number of points in the GSF geometry definition.
Geometry Description
The geometry description has N lines, where N is the number of points declared in the previous section. Each line has 11 space separated values representing one point in the geometry.
| Column | Description |
|---|---|
| LON | The longitude of the point. |
| LAT | The latitude of the point. |
| DEP | The depth of the point (in kilometres, with -10 meaning 10km below ground level). |
| SUB_DX | The subdivision length in the strike direction. |
| SUB_DY | The subdivision length in the dip direction. |
| LOC_STK | The fault segment strike. |
| LOC_DIP | The fault segment dip. |
| LOC_RAKE | The fault segment rake. |
| SLIP | The total slip at this point (cm), usually -1. |
| INIT_TIME | The initial rupture time of this point, usually -1. |
| SEG_NO | The number corresponding to the segment this point belongs to.: |