SCEC Broadband Platform Capabilities and Plans

1. SCEC Broadband Platform Capabilities and Plans Philip MaechlingInformation Technology ArchitectSouthern California Earthquake Center (SCEC)28 January 2008 SCEC: An NSF + USGS Research Center

2. Running a Simple BBP Example Purpose: • Calculate 10Hz seismograms (and spectral amplitudes) using a combinations of codes. Combine Results of Available Codes: • Rupture Generators – URS and UCSB • Low Frequency Codes – URS and UCSB • All codes use 1D velocity models for low frequency calculations. • High Freq Codes – URS and UCSB and SDSU/ETH

3. Low Freq Sim Spectral Amplitudes Rupture Generator High Freq Sim Rupture Variation Rupture Config Seismograms Seismograms Broadband Platform Workflow Greens Functions Amps

4. Running a Simple BBP Example • Select the collection of codes you would like to run and type in the number of that set of codes.

5. Input a Rupture Description

6. Input a Station Location File

7. Input a Station 1D Velocity Model

8. Running a Simple BBP Example • Login into the SCEC computer (intensity.usc.edu) • User account: bband • Pwd: TBD • Move to the configuration directory • Type “start” • This is an alias that will move you to the configuration directory • Review the three input files: • Eq.src – Earthquake Source Description • Stations.ll – Station Locations in Lat/lon (decimal degrees) • BB01-01.vld – velocity model • Run the platform by typing: • Type “run_bbp.py” • This is the name of the top level BB Platform script

9. BB Platform Directory Structure • Every simulation is assigned a “simulation id” • This is basically a timestamp (epoch seconds) • Will wrap in about 3 months • Information about a simulation is keyed to this number • Input, tmp, and output directories are created for a simulation and the files related to the simulation are stored in these directories • The user should only need to look at the “data” directory, the output directory that contains the broadband seismograms and the metadata file.

10. BB Platform Directory Structure • To help keep track of how seismograms were created, a “metadata.txt” file is created for each simulation. • This lists the programs and the parameters used to create the seismograms.

11. BB Metadata File Structure

12. Broadband Platform “Hanging Wall” Exercise

13. Broadband Platform Seismograms

14. Broadband Platform Station SA Amplitudes

15. Low Freq Sim Spectral Amplitudes Rupture Generator High Freq Sim Rupture Variation Rupture Config Seismograms Seismograms BB Platform Directory Structure Platform is designed by creating “components” that can be interchanged. A component is a python script that wraps all the executables and scripts needed to do that processing.

16. BB Platform Directory Structure Next Steps: • Distribute programs so that we can run on supercomputers. • Add new components by creating new components using new codes • Integrate capability to run 3D low frequency simulations • Integrate capability to just run HF part to add HF to low frequency seismograms.

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