Broadband User Guide

If you find errors in this document or sections to be unclear, please either fix them yourself or contact Scott Callaghan (scottcal@usc.edu) or Philip Maechling (maechlin@usc.edu).

Installing the Second-Generation Broadband Platform

Installing the Broadband Platform involves obtaining a copy of the code and building the required executables. You can either download the platform from the Broadband web site (http://www.scec.org/research/broadband) or check the code out of SCEC's Subversion repository. Most users should download the platform.

System Dependencies

The current version of the Broadband Platform is designed to run on standard Linux machines. Testing has been performed on SCEC's development servers running Fedora Core 10 (kernel version 2.6.27.41-170.2.117.fc10.x86_64). In this guide we outline how to install the platform into your own account on a Linux computer using the simplest approach.

Software Dependencies

The Broadband Platform has certain software dependencies.

Required:

• Python 2.5+ with
  • PyGTK
  • Matplotlib
  • Numpy

• Intel compilers

Optional:

• GMT tools (for plots)
• Matlab

Setting Up Your Account

Users should set up their accounts to use a bash shell. The user environment is a common source of problems since certain environment variables must be defined for the platform to work correctly.

To check your account, make sure you can run basic commands like ls and cd before proceeding.

Downloading the Platform

Download 4 files from the Broadband website, the code (bbp_dist_<version>.tgz), the data (bbp_data_<version>.tgz), and their checksum files (bbp_dist_<version>.tgz.md5 and bbp_data_<version>.tgz.md5). The code file is about 100 MB, the data file about 3 GB. After you've downloaded the files to your local Linux system, the next step is to calculate the checksums yourself and compare them to the checksums you downloaded.

First, verify that the md5sum command is in your path:

$> which md5sum

You should get something like /usr/bin/md5sum. If you see the message 'no md5sum in …', contact your Linux system administrator and ask to have md5sum added to your path.

Once you can run the md5sum command, run:

$> md5sum -c bbp_dist_<version>.tgz.md5
$> md5sum -c bbp_data_<version>.tgz.md5

You should get the messages

bbp_dist_<version>.tgz.md5: OK
bbp_data_<version>.tgz.md5: OK

If you get FAILED instead, re-download the tgz files and try again. When it passes, that means the files were downloaded without error.

Once both files have passed the checksum test, untar the files.

$> tar xzvf 
$> tar xzvf 

If multiple users are planning to use the platform on the same system, you only need one copy of the data files per machine. Each user will still need his or her own copy of the code files.

Alternatively, if you would like access to the latest version of the platform and get frequent but less thoroughly tested improvements, you can check out the platform from SCEC's Subversion repository. Only advanced users should take this approach, outlined in detail in section 1.8.

Platform Setup

After you've obtained a copy of the project, you'll need to make sure the comps directory is on Python's path so Python can find all the project modules. If you're running a Bash shell, add the following line to your .bash_profile with your favorite text editor:

export PYTHONPATH=<path to comps directory>:$PYTHONPATH

If you're running a C-shell, add the following line to your .cshrc with your favorite text editor:

setenv PYTHONPATH <path to comps directory>:$PYTHONPATH

When running elements of the platform over ssh, be sure to enable ssh forwarding (with the -X or -Y options).

After modifying your login script above, log out and log back into the machine so the changes are reflected in your environment.

Directory Structure

The platform consists of two top-level directories, bbp_2g and bbp_2g_gf. bbp_2g contains the source code, executables, scripts, tests, input, working, and output directories. bbp_2g_gf contains the Green's Functions, input files for the validation events, and other required input files for the various code bases. Note that indata, logs, outdata, and tmpdata are created when the platform is first run, so they will be missing when you first check the platform out.

bbp_2g has the following directories:

• checksums: Contains checksums for bbp_2g_gf files
• comps: The Python scripts to run the platform
• etc: Miscellaneous utility scripts
• examples: Contains example input files
• indata: An internal directory, used to stage input files
• logs: Contains logs from BBP runs
• outdata: Contains output files from a run
• ref_data: Contains reference files for BBP tests
• start: Put input files for an interactive run here
• src: Source code for BBP modules
• tests: Contains unit and acceptance tests
• tmpdata: An internal directory, used during a run
• xml: Contains XML files which describe simulations and can be used as input

bbp_2g_gf has the following directories:

• compare: Contains observed seismograms for validation events
• plot: Data files for GMT plots
• sdsu, ucsb, urs: Contains Green's functions, velocity files, and other required inputs for the codebases.

In general, you will be interacting with the start directory for input files, comps to run the platform, tests to test the platform, and outdata to examine data products.

Building the Platform

Once you have checked out the code, you need to build it. By default, every executable is compiled using the compiler recommended by the code developer. However, if you have limited compiler options or are building the codes on an untested system, you may need to specify non-standard alternative compilers, as described below.

Before you can build the platform, you need to make sure that the Intel compilers are in your path. This is done automatically on intensity.usc.edu, but on other systems you can check by typing:

$>which icc

If you get the message “no icc in …”, then you'll need to add the Intel compilers to your path. Once the Intel compilers are in your path, you can make the code by cd-ing to the bbp_2g/src directory and typing:

$> make

It takes a minute or two to build the code.

Additionally, you need to tell the platform where it's installed. Edit the file bbp_2g/comps/install_cfg.py with your favorite text editor, and edit the lines

self.A_INSTALL_ROOT = <bbp_2g directory>
self.A_GF_DIR = <bbp_2g_gf directory>

with the paths on your system to the bbp_2g directory (the source) and the bbp_2g_gf directory (the data) that you unzipped. For example, it could be /home/scottcal/broadband_platform/bbp_2g and /home/scottcal/broadband_platform/bbp_2g_gf.

By default, every executable is compiled using the compiler recommended by the code developer. Depending on the system, some compilers may not be available to you. You can override the C and Fortran compilers used by editing

src/makefile

Uncomment USER_C and set FC and CC to the compilers you wish. For example:

Before:

#USER_C=1
FC=f77
CC=gcc

After (an example, you may choose different compilers):

USER_C=1
FC=gfortran
CC=gcc

Note that not all compiler combinations have been thoroughly tested. You may encounter build errors.

Once the platform has been successfully built, you can move on to running the tests to verify that all components are working correctly.

Advanced Users

Alternatively, if you would like access to the latest version of the platform, to get frequent but less thoroughly tested improvements, you can check out the platform from SCEC's Subversion version control repository on intensity.usc.edu. Only advanced users should follow this approach. If you are unsure, you should download the code as outlined in section 1.2 and skip this section.

You may need to request access from the SCEC system administrator, John Yu (johnyu@usc.edu). Make sure you have subversion in your path before beginning.

Once you have access, you'll need to decide if you want a stable tagged version, or the latest version in the repository. For a stable version, open a terminal window on the system of your choice and type:

$> svn checkout https://source.usc.edu/svn/broadband/tags/<stable version> bbp_2g

For the latest version, type:

$> svn checkout https://source.usc.edu/svn/broadband/trunk bbp_2g

This will check out the project to your local machine. It contains the source code, tests, and some example files. You also need to obtain a copy of the Broadband Platform data files, containing the Green's tensors. They are too large to be stored in version control. You can obtain a copy from the [on intensity. If you are working on intensity as well, you can just create a symbolic link:

$> ln –s /home/scec-00/scottcal/bband/bbp_2g_gf <path to your gf directory>

If you are not working on intensity, or don't have an intensity username, you can get a .tgz file of the Green's functions from the same download site you obtained this guide.

Periodically you should check for updates to the code. To do so, go to your bbp_2g directory and type

$> svn update

This will pull down any code updates that have been made in the repository. After you update, make the code again (detailed in section 1.5) so that any code changes are captured in the executables.

Running the Tests

The broadband platform contains three kinds of tests. The checksum tests verify that the data files were copied correctly and you have all the files that are expected. Unit tests run each module using a set of input files, and compare the results against known outputs. They verify that each module has been built and is working correctly. Acceptance tests verify that the modules are working correctly together. They test the platform end-to-end using different combinations with known inputs and compare the results. All the possible module combinations for both user-defined and validation events are tested as checks against integration errors.

Begin with the checksum tests. Once they past, run the unit tests and finally the acceptance tests.

Running Checksum Tests

To run the checksum tests, change to the checksums directory and run md5sum_check.py.

$> cd checksums
$> ./md5sum_check.py

It takes about 5 minutes to compute the checksums. If a checksum disagrees, that means that the contents of the datafile were not what was expected. Try reinstalling the data files and try again. If you continue to get a checksum error, contact support.

Once the checksums agree, move on to the unit tests.

Running Unit Tests

To run the unit tests, change to the tests directory and run UnitTests.py.

$> cd tests
$> ./UnitTests.py

The unit tests take about 15 minutes to run. When they're complete, the console will either print “OK” or how many tests failed. If a test has failed, first check that you have built the executables. You can rerun just the specific test that failed (test_<module>.py). If the test is still failing, also verify that you have the ref_data directory, since it contains the input and reference files. If you can't determine the reason for the failure, contact support.

Once the unit tests all pass, proceed to the acceptance tests.

Running Acceptance Tests

Make sure the unit tests pass before moving on to the acceptance tests. To run the acceptance tests, change to the tests directory (if you're not there already) and run AcceptTests.py. The acceptance tests take a long time to run, around 20 hours

$> cd tests
$> ./AcceptTests.py

Since they take so long to run, you may want to background them instead and redirect their output:

$> ./AcceptTests.py &> accept.out &

When they're complete, the console will either print “OK” or how many tests failed. If you system lacks MATLAB, you may find that a number of the acceptance tests are skipped. These are tests which require MATLAB, and skipping them is to be expected. Acceptance test failures indicate that the modules are not integrated correctly. Like with the unit tests, verify that you have the ref_data directory and that everything is built before contacting support.

Since the acceptance tests can take a long time to run, you may wish to resume where you left off. This feature is supported automatically. If you do not wish to resume, delete the resume file in ref_data/accept_inputs/resume.txt.

Performing Simulations

The platform supports two kinds of simulations, validation events and user-defined events. Validation simulations are performed using a historical event, and are directly compared to observed seismograms using goodness-of-fit. User-defined events are run using a rupture description provided by the user which may not necessarily be a historical earthquake.

When you run a simulation, the platform assigns an ID to it. This ID can be used to track the simulation and locate the output data products.

To supply input files to the platform, put them in the start directory. Extensions are important – the platform recognizes station lists (.stl), SRF files (.srf), and simple source descriptions (.src). If there are multiple files of a type, the platform will prompt the user to select one.

To perform a simulation, a user selects between different required and optional modules. Below we present a summary of the various modules.

Modules

The broadband platform consists of a series of modules. There are two main types of modules, science modules and utility modules. Science modules are those for which the platform has multiple implementations, provided by different coding research groups. Utility modules only have 1 implementation. A schematic of the available modules and their flow relationships is shown below:

Science Modules

All simulations must include a low-frequency, high-frequency, and site response science module. Simulations may include an optional rupture generation science module. Users may select between the following different implementations of each of these modules:

Rupture generation:URS, UCSB

Low-frequency:URS, UCSB

High-frequency:URS, UCSB, SDSU

Site response:URS, UCSB, SDSU

Utility Modules

A spectral response utility module is automatically run after the site response module. Additionally, users may select an optional goodness-of-fit utility module to run at the conclusion of the simulation. In the case of a user-defined event, users select a historical event or previously run simulation to use as the comparison for goodness-of-fit.

Validation Simulations

To run a validation simulation, go to the comps directory and run run_bbp_2G.py. The platform will ask you a series of questions. Answer 'y' to “Do you want to perform a validation run?”

$> cd comps
$> ./run_bbp_2G.py
Welcome to the SCEC Broadband Platform.
Please select the modules you want to run.
Do you want to perform a validation run (y/n)? y
Do you want to validate with:
Northridge (1)
Loma Prieta (2)
Landers (3)
?
...

No input files are required by the user. However, you may wish to run with a reduced station list to speed up the computations. You can put your own station list into the start directory (the format is described in section 5.3). Note that any stations which do not have observed seismograms will not be included in the automatically generated goodness-of-fit comparison.

In addition to the low-frequency modules which compute seismograms using 1D Green's Tensors, validation events can also be run using precomputed 3D seismograms to supply the low-frequency.

User-defined Simulations

To run a user-defined simulation, two input files are required, a rupture description and a station list. The rupture description can either be in SRF format or a simplified rupture description (the format is described in section 5.1). To run a user-defined simulation, run run_bbp_2G.py.

$> cd comps
$> ./run_bbp_2G.py
Welcome to the SCEC Broadband Platform.
Please select the modules you want to run.
Do you want to perform a validation run (y/n)? y
Do you want to run a rupture generator (y/n)? 
...

You may then choose if you want to run a rupture generator. This is necessary if you're supplying a simple rupture description. If you're supplying an SRF file, you can skip this. Next you can select from different module implementations. Finally, you have the option to run goodness-of-fit against either observed seismograms or another simulation.

...
Do you want to run goodness of fit (y/n)? y
What reference files would you like to compare to? Enter a simulation ID or a scenario name: <comparison>
Enter a label to use for the comparison seismograms: <label>

The label will be used in GoF plots to distinguish one set of results from the other.

The user-defined events must be within one of the regions supported by the platform – Southern California, Northern California, or the Mojave. The platform will automatically select a region based on the event hypocenter. If the event falls outside of these regions, you'll get an error.

Logging

During the run, log files will be produced in logs/<simulation ID>/<simulation ID>.<module name>.log. If the platform fails, this is a good place to look to determine the error. Additionally, any fatal errors will be recorded in fatal_error.log.

Metadata capturing all the executable calls is located in tmpdata/<simulation ID>/metadata.txt for careful tracing of exactly what was called. Both the log files and metadata can be useful if troubleshooting an issue.

Data Products

The platform produces a variety of data products. All data products are located in outdata/<simulation ID>. On most Linux systems, you can show images using display:

$> display <PNG file>

Make sure you have X11 forwarding enabled.

Station map

To help visualize the stations in relationship to the fault, the platform produces a PNG file displaying station locations with red circles and the fault plane with a black line, on an image of California. You can find this file in outdata/<simulation ID>/station_map.png.

Seismograms

When running the platform, you have the option to output velocity and acceleration seismograms, for each station. Plots of these files can be found in outdata/<simulation ID>/<simulation ID>.<station>_<velocity or acceleration>_seis.png.

The raw seismogram data is available in outdata/<simulation ID>/<simulation ID>.<station>.bbp (velocity) and outdata/<simulation ID>.<station>.acc.bbp (acceleration). Its format is described in section 5.4.

To compare seismogram data, you can run comps/plotit.py with two seismograms. It will plot them both for comparison. From the comps directory, run:

$> ./plotit.py <path to seismogram 1> <path to seismogram 2>

Response spectra

The respect code, run at the end of each simulation, calculates the response spectra for each station. The raw respect data is located at

outdata/<simulation ID>/<simulation ID>.<station>.rsp

in the format described in section 5.5.

Goodness-of-fit

If you run goodness-of-fit, several additional data products are produced. The goodness-of-fit comparison is performed by comparing the response spectra of a set of calculated seismograms to seismograms from another simulation or observed seismograms. For each station involved in the comparison, a plot comparing the response spectra can be found at outdata/<simulation ID>/<comparison label>_<simulation ID>_<station>_rsp.png. A plot showing the seismograms on top and bottom can be found at outdata/<comparison label>_<simulation ID>_<station>_overlay.png. The goodness-of-fit plot can be found at gof-<comparison label>-<simulation ID>_r0-<cutoff distance>.png.

Note that at least 3 stations must be run for goodness-of-fit to be valid. If fewer than 3 stations are run, no goodness of fit calculation will be performed.

Rupture files

When a user-defined event is simulated, the user has the option to run a rupture generator. This generator produces an SRF file, found in outdata/<simulation ID>/*.srf. This file can be put in the start directory and used in future runs. Additionally, the platform produces a plot of the cumulative slip on the fault surface, outdata/<simulation ID>/<SRF prefix>.png.

Platform Modes

The platform can be run in multiple modes. The default is interactive mode, in which the user is prompted to answer a series of questions. Once all the information has been gathered, the run begins.

For a large number of runs, or if the user is repeating a specific run, this can be tedious. The platform provides two other ways to describe a run, with an option file or an XML description.

An option file provides responses to all the questions that the platform poses. The format is described in section 5.6, but it's basically a text file, 1 entry per line, with support for comments. It can be fed to the platform using the -o option.

The platform will also accept XML files containing a full description of a run. The schema for these files is given in section 5.7. These files are also produced by the platform after every simulation, and placed in xml/<simulation ID>.xml. So if you want to rerun a simulation, you can point the platform to the XML file from that simulation using the -x option. Note that a new simulation ID will be assigned to the run, so there is no risk of overwriting previous simulation results.

Available Options

To get a list of the current available options, run run_bbp_2G.py with the -h flag.

$> ./run_bbp_2G.py -h
Usage: run_bbp_2G.py [options]
Options:
 -h, --help show this help message and exit
 -x XML_FILE, --xml-file=XML_FILE
   Run using XML description of workflow
 -s SIM_ID, --simID=SIM_ID
   Force a simID
 -o OPTFILE, --option-file=OPTFILE
   File containing responses to interactive platform prompts
 -v, --version Broadband platform version
 -g, --generate-xml Generates the XML description but does not run the platform
 -l LOG_FILE, --log=LOG_FILE
   Store all output in a file
 -x: The platform will run a simulation from the XML description.
 -s: Force the platform to run with a given simID (a nonnegative integer)
 -o: Use an option file providing answers to the platform prompts
 -v: Prints the version of the platform and exits.
 -g: The platform will generate an XML description but not actually run the workflow. Useful if you want to create simulation descriptions and run them later.

Cleanup

After a while, you may find that your indata, tmpdata, outdata, and logs directories are getting cluttered with files from past runs. If you wish to delete these old files, you can use the clean_directories.sh script in the etc directory.

$> cd etc
$> ./clean_directories <days>

Any simulation ID directories in the indata, tmpdata, outdata, and logs directories which were last accessed <days> days or longer ago will be deleted. If you have a few directories you want to keep, either copy them somewhere else, or copy them to a directory name that's not all digits and they won't be deleted.

Examples

Below are some examples that you can try using the sample files in the examples directory. Make sure all the tests pass before you try this. You should be in the comps directory when you start these examples:

$> cd comps

Sample Validation Run

You don't need to move any files for this. Notice that 3D seismograms are a low-frequency option, since you're running a validation event.

$> ./run_bbp_2G.py 
Welcome to the SCEC Broadband Platform.
Please select the modules you want to run.
Do you want to perform a validation run (y/n)? y
Do you want to validate with:
Northridge (1)
Loma Prieta (2)
Landers (3)
?1
Do you want to
run all validation stations (1)
select a station list (2)
?1
Choose a source of low frequency seismograms:
URS module (1)
URS 3D seismograms (2)
UCSB module (3)
SDSU module (4)
SDSU 3D seismograms (5)
?2
Choose a high frequency module:
URS (1)
UCSB (2)
SDSU (3)
?1
Choose a site response module:
URS (1)
UCSB (2)
SDSU (3)
?1
Do you want to plot velocity seismograms (y/n)? y
Do you want to plot acceleration seismograms (y/n)? y

This simulation takes about 10 minutes. Once it's complete the platform will tell you:

You can find results in <path to bbp_2g install>/outdata/<simulation ID> .

In that directory you will find:

• Velocity seismograms (<simulation ID>.<station>.bbp)
• Acceleration seismograms (<simulation ID>.<station>.acc.bbp)
• Plots of velocity seismograms (<simulation ID>.<station>_velocity_seis.png)
• Plots of acceleration seismograms (<simulation ID>.<station>_acceleration_seis.png)
• Response spectra files (<simulation ID>.<station>.rsp)
• Plots comparing simulated and observed seismograms (Northridge_<simulation ID>_<station>_overlay.png)
• Plots comparing simulated and observed response spectra (Northridge_<simulation ID>_<station>_rsp.png)
• Overall goodness-of-fit plots (gof-Northridge-<simulation ID>_r0-25.png)

Sample Validation run, custom stations

If the validation runs aren't performed with 3D low-frequency, it can take a long time, up to 10 minutes per station. Sometimes you might want to run with a reduced station list so the simulation will run faster.

Copy the files in example/valid_custom_stations into the start directory. Take a look at the format of the station file:

$> more valid_test_stat.stl 
#Required: lon, lat, station name, distance to fault plane, Vs30
#Optional: low freq corner, high freq corner
#Unused: station information
#lon lat stationdist Vs30 LF corner HF corner station information
-118.6417 34.5640 cast 20.47 450 0.120 23.0 CSMIP peer.berkeley.edu/nga
-118.4180 34.0628 lacn 22.82 278 0.140 23.0 CSMIP peer.berkeley.edu/nga
-118.8811 34.2886 moor 24.16 405 0.160 23.0 CSMIP peer.berkeley.edu/nga

Now, run the platform, using a station list:

$> ./run_bbp_2G.py 
Welcome to the SCEC Broadband Platform.
Please select the modules you want to run.
Do you want to perform a validation run (y/n)? y
Do you want to validate with:
Northridge (1)
Loma Prieta (2)
Landers (3)
?1
Do you want to
run all validation stations (1)
select a station list (2)
?2

If you have multiple station list files in your start directory, you may see the following prompt asking you to select one. If you only have one, the platform will select it automatically.

Found multiple BBP station list files in the start directory. Please select one:
nr_one_stat.stl (1)
valid_test_stat.stl (2)
?2
Choose a source of low frequency seismograms:
URS module (1)
URS 3D seismograms (2)
UCSB module (3)
SDSU module (4)
SDSU 3D seismograms (5)
?3
Choose a high frequency module:
URS (1)
UCSB (2)
SDSU (3)
?2
Choose a site response module:
URS (1)
UCSB (2)
SDSU (3)
?2
Do you want to plot velocity seismograms (y/n)? y
Do you want to plot acceleration seismograms (y/n)? y

Again, when the run completes in about 15 minutes you can find results in the output directory. You'll notice far fewer files, as only 3 stations were run instead of 133. The goodness-of-fit plots won't look very good – more stations are really needed to get an accurate plot.

Sample User-defined run with source description

Next let's try running a user-defined event. Copy examples/user_rup_gen/nr_one_stat.stl and examples/user_rup_gen/user_eq.src to the start directory. user_eq.src is a simple source description. Its format is outlined in section 5.1. Since this is a user-defined event, precomputed 3D seismograms aren't a valid option.

$> ./run_bbp_2G.py 
Welcome to the SCEC Broadband Platform.
Please select the modules you want to run.
Do you want to perform a validation run (y/n)? n
Do you want to run a rupture generator (y/n)? y
Rupture generators:
URS (1)
UCSB (2)
?1
Using region: Southern California
Choose a low frequency module:
URS (1)
UCSB (2)
?2
Found multiple BBP station list files in the start directory. Please select one:
nr_one_stat.stl (1)
valid_test_stat.stl (2)
?1
Choose a high frequency module:
URS (1)
UCSB (2)
SDSU (3)
?2
Choose a site response module:
URS (1)
UCSB (2)
SDSU (3)
?1
Do you want to plot velocity seismograms (y/n)? y
Do you want to plot acceleration seismograms (y/n)? y
Do you want to run goodness of fit (y/n)? n

Since this run only includes one station, it will run in about 5 minutes. In the output directory you'll notice there are no goodness-of-fit or files, since we didn't run goodness-of-fit. However, there is also a map file (station_map.png), showing the fault plane and the stations, and a plot of the rupture slip (user_eq.png). The SRF generated by the rupture generator is in user_eq.srf; this file could be used in future runs. The filenames of the rupture slip plot and SRF are taken from the rupture description filename.

Sample User-defined run with SRF file and goodness-of-fit

Finally, try a run with an SRF file and run goodness-of-fit on the results. Copy in examples/user_no_rup_gen/ucsb_modSRF_0.srf and examples/user_no_rup_gen/nr_three_stat.stl

$> ./run_bbp_2G.py 
Welcome to the SCEC Broadband Platform.
Please select the modules you want to run.
Do you want to perform a validation run (y/n)? n
Do you want to run a rupture generator (y/n)? n
Using region: Southern California
Choose a low frequency module:
URS (1)
UCSB (2)
?1
Found multiple BBP station list files in the start directory. Please select one:
nr_one_stat.stl (1)
valid_test_stat.stl (2)
nr_three_stat.stl (3)
?3
Choose a high frequency module:
URS (1)
UCSB (2)
SDSU (3)
?3
Choose a site response module:
URS (1)
UCSB (2)
SDSU (3)
?1
Do you want to plot velocity seismograms (y/n)? y
Do you want to plot acceleration seismograms (y/n)? y
Do you want to run goodness of fit (y/n)? y
What reference files would you like to compare to? Enter a simulation ID or a scenario name: Northridge
Enter a label to use for the comparison seismograms: nr

The reference files can either be a scenario event or a simulation ID previously run. The label is just for the figures when comparisons are plotted.

This run will take about 15 minutes, and the results can be found in the appropriate outdir. Again, the goodness of fit measures will look poor due to the few stations involved in the comparison. If you had fewer than 3 stations, no goodness-of-fit plots would be produced. However, response spectra comparison plots will still be generated.

File Formats

This section offers descriptions of various file formats in the broadband platform.

Simple source description

This is the format for the simple source description. It is not whitespace sensitive. The filename must end in .src for the platform to identify it as a source description.

MAGNITUDE = <magnitude>
FAULT_LENGTH = <length of fault>
DLEN = <DX, along length>
FAULT_WIDTH = <down-dip fault width>
DWID = <DY, along width>
DEPTH_TO_TOP = <depth of fault below surface>
STRIKE = <strike>
RAKE = <rake>
DIP = <dip>
LAT_TOP_CENTER = <latitude of top center point in fault plane>
LON_TOP_CENTER = <longitude of top center point in fault plane>
HYPO_ALONG_STK = <along strike location of hypocenter (0.0 = middle)>
HYPO_DOWN_DIP = <down dip location of hypocenter (0.0 = top)>
DT = <dt>
SEED = <random seed used in calculations>
CORNER_FREQ = <corner frequency to use>

SRF rupture description

Details of the Standard Rupture Format (SRF) are given in more detail in the accompanying document. The general fault surface is represented by a distribution of point sources, and it can support one or more planes. The platform produces SRFs as output from rupture generators, but a user can also supply an SRF file as input for user-defined simulations. SRF filenames must end with the suffix .srf for the platform to correctly identify them.

Station File List

The user may specify a list of stations, matching the following format:

#optional
%comment
# lines
<lon> <lat> <stat name> <distance to fault trace> <Vs30> <LF corner> <HF corner> <stat info>
…

The station list filename needs to end in .stl for the platform to recognize it as a station list.

BBP seismograms

All intermediate and output seismograms are produced in a 4-column text format, whether velocity or acceleration.

# optional
% comment
# lines
<timestamp> <North/South> <East/West> <Up/Down>
…

Time is in seconds and motion is in cm/s (velocity) or cm/s/s (acceleration) unless otherwise specified in the header. Velocity filenames end in .vel.bbp; accelerations in .acc.bbp.

Response spectra

The response spectra file is in 4-column text format.

# optional
% comment
# lines
<period (sec)> <North/South> <East/West> <Up/Down>
…

The platform samples response spectra at 112 periods, 0.01-20 sec and outputs pseudo spectral acceleration in units of g.

Option File

Option files contain responses to the prompts in the platform. You can use them with the -o option to run_bbp_2G.py. The responses have to match the prompts exactly. For example, if you craft an option file assuming there is only one station list in the start directory (and therefore the user isn't prompted to select one) but then it is run with multiple station lists in the start directory, this will cause the run to abort. Option files are recommended to perform a series of runs with different inputs or different modules. If you have a run you perform regularly, it's better practice to run the platform with the -g option and the option file to produce an XML description, which are more complete descriptions of the workflow.

#optional comments
%using either symbol
n #comments
y % can go
1 # here
…

Use with:

$> ./run_bbp_2G.py -o <option file>

XML workflow description schema

Each time the platform is invoked, an XML file is produced describing the workflow, obeying the following schema:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name= “BBP_Run_Specification” minOccurs= “1” maxOccurs= “1”>
  <xs:complexType>
    <xs:sequence>
      <xs:element name= “Validation_Run” minOccurs= “0” maxOccurs = “1”>
        <xs:attribute name= “event” type= “xs:string” use= “required” />
        <xs:attribute name= “input_station_file” type = “xs:string” />
        <xs:attribute name= “subset” type = “xs:boolean” use = “required” />
      </xs:element>
      <xs:element name= “BBP_Modules”>
        <xs:complexType>
          <xs:sequence>
            <xs:element name = “BBP_Module” maxOccurs = “unbounded” >
              <xs:complexType>
                <xs:sequence>
                  <xs:element name= “name” type=”xs:string” />
                  <xs:element name= “staged_files” >
                    <xs:complexType>
                      <xs:sequence>
                        <xs:element name=“file” type=“xs:string” maxOccurs= “unbounded”/>
                      </xs:sequence>
                    </xs:complexType>
                  </xs:element>
                  <xs:element name= “arguments” >
                    <xs:complexType>
                      <xs:sequence>
                        <xs:element name=“argument” type=“xs:string” maxOccurs=“unbounded”>
                          <xs:attribute name= “type” type= “xs:string” user= “required” />
                        </xs:element>
                      </xs:sequence>
                    </xs:complexType>
                  </xs:element>
                </xs:sequence>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
</xs:element>

These files are difficult to construct by hand, but can be generated using the -g flag when running run_bbp_2G.py.

User Support

If you run into bugs with the platform, you can open a trouble ticket at the Broadband Trac site.

Check to see if there has already been a ticket opened for the bug. If you are unable to get the platform to run, you can get direct user support by emailing scottcal@usc.edu.

Appendix A: Possible Module Permutations

Validation Events

Permutation #	Low-frequency module	High-frequency module	Site response
1	URS 1D	URS	URS
2	URS 1D	URS	UCSB
3	URS 1D	URS	SDSU
4	URS 1D	UCSB	URS
5	URS 1D	UCSB	UCSB
6	URS 1D	UCSB	SDSU
7	URS 1D	SDSU	URS
8	URS 1D	SDSU	UCSB
9	URS 1D	SDSU	SDSU
10	URS 3D precomputed	URS	URS
11	URS 3D precomputed	URS	UCSB
12	URS 3D precomputed	URS	SDSU
13	URS 3D precomputed	UCSB	URS
14	URS 3D precomputed	UCSB	UCSB
15	URS 3D precomputed	UCSB	SDSU
16	URS 3D precomputed	SDSU	URS
17	URS 3D precomputed	SDSU	UCSB
18	URS 3D precomputed	SDSU	SDSU
19	UCSB 1D	URS	URS
20	UCSB 1D	URS	UCSB
21	UCSB 1D	URS	SDSU
22	UCSB 1D	UCSB	URS
23	UCSB 1D	UCSB	UCSB
24	UCSB 1D	UCSB	SDSU
25	UCSB 1D	SDSU	URS
26	UCSB 1D	SDSU	UCSB
27	UCSB 1D	SDSU	SDSU
28	SDSU 1D	URS	URS
29	SDSU 1D	URS	UCSB
30	SDSU 1D	URS	SDSU
31	SDSU 1D	UCSB	URS
32	SDSU 1D	UCSB	UCSB
33	SDSU 1D	UCSB	SDSU
34	SDSU 1D	SDSU	URS
35	SDSU 1D	SDSU	UCSB
36	SDSU 1D	SDSU	SDSU
37	SDSU 3D precomputed	URS	URS
38	SDSU 3D precomputed	URS	UCSB
39	SDSU 3D precomputed	URS	SDSU
40	SDSU 3D precomputed	UCSB	URS
41	SDSU 3D precomputed	UCSB	UCSB
42	SDSU 3D precomputed	UCSB	SDSU
43	SDSU 3D precomputed	SDSU	URS
44	SDSU 3D precomputed	SDSU	UCSB
45	SDSU 3D precomputed	SDSU	SDSU

User-Defined Events

Permutation #	Rupture generator	Low-frequency	High-frequency	Site response
1	URS	URS	URS	URS
2	URS	URS	URS	UCSB
3	URS	URS	URS	SDSU
4	URS	URS	UCSB	URS
5	URS	URS	UCSB	UCSB
6	URS	URS	UCSB	SDSU
7	URS	URS	SDSU	URS
8	URS	URS	SDSU	UCSB
9	URS	URS	SDSU	SDSU
10	URS	UCSB	URS	URS
11	URS	UCSB	URS	UCSB
12	URS	UCSB	URS	SDSU
13	URS	UCSB	UCSB	URS
14	URS	UCSB	UCSB	UCSB
15	URS	UCSB	UCSB	SDSU
16	URS	UCSB	SDSU	URS
17	URS	UCSB	SDSU	UCSB
18	URS	UCSB	SDSU	SDSU
19	UCSB	URS	URS	URS
20	UCSB	URS	URS	UCSB
21	UCSB	URS	URS	SDSU
22	UCSB	URS	UCSB	URS
23	UCSB	URS	UCSB	UCSB
24	UCSB	URS	UCSB	SDSU
25	UCSB	URS	SDSU	URS
26	UCSB	URS	SDSU	UCSB
27	UCSB	URS	SDSU	SDSU
28	UCSB	UCSB	URS	URS
29	UCSB	UCSB	URS	UCSB
30	UCSB	UCSB	URS	SDSU
31	UCSB	UCSB	UCSB	URS
32	UCSB	UCSB	UCSB	UCSB
33	UCSB	UCSB	UCSB	SDSU
34	UCSB	UCSB	SDSU	URS
35	UCSB	UCSB	SDSU	UCSB
36	UCSB	UCSB	SDSU	SDSU
37	User-supplied SRF	URS	URS	URS
38	User-supplied SRF	URS	URS	UCSB
39	User-supplied SRF	URS	URS	SDSU
40	User-supplied SRF	URS	UCSB	URS
41	User-supplied SRF	URS	UCSB	UCSB
42	User-supplied SRF	URS	UCSB	SDSU
43	User-supplied SRF	URS	SDSU	URS
44	User-supplied SRF	URS	SDSU	UCSB
45	User-supplied SRF	URS	SDSU	SDSU
46	User-supplied SRF	UCSB	URS	URS
47	User-supplied SRF	UCSB	URS	UCSB
48	User-supplied SRF	UCSB	URS	SDSU
49	User-supplied SRF	UCSB	UCSB	URS
50	User-supplied SRF	UCSB	UCSB	UCSB
51	User-supplied SRF	UCSB	UCSB	SDSU
52	User-supplied SRF	UCSB	SDSU	URS
53	User-supplied SRF	UCSB	SDSU	UCSB
54	User-supplied SRF	UCSB	SDSU	SDSU