SCEC: An NSF + USGS Research Center

SCEC Broadband Platform Capabilities and Plans

Philip MaechlingInformation Technology ArchitectSouthern California Earthquake Center (SCEC)28 January 2008

Running a Simple BBP ExamplePurpose:

– 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

Broadband Platform Workflow

Amps

Greens Functions

RuptureGenerator

Low FreqSim

High FreqSim

RuptureConfig

RuptureVariation

Seismograms Seismograms

SpectralAmplitudes

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.Number Rupture Model

GeneratorLow Frequency Seismogram

High Frequency Seismograms

1 URS URS URS

2 URS UCSB UCSB

3 URS URS SDSU

4 UCSB UCSB UCSB

5 UCSB URS URS

6 UCSB URS SDSU

Input a Rupture Description

Input a Station Location File

Input a Station 1D Velocity Model

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

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.

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.

BB Metadata File Structure

Broadband Platform “Hanging Wall” Exercise

Broadband Platform Seismograms

Broadband Platform Station SA Amplitudes

BB Platform Directory StructurePlatform 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.

RuptureGenerator

Low FreqSim

High FreqSim

RuptureConfig

RuptureVariation

Seismograms Seismograms

SpectralAmplitudes

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.

End