Software to Download

• 3D focal mechanisms

  

  Authors:	Keith A. Labay and Peter J. Haeussler
  Usage:	View earthquake focal mechanism symbols three dimensionally
  Platform:	Windows
  Interface:	ArcScene® 9.x
  Input:	A GIS point dataset of earthquake locations containing strike, dip, and rake values for a nodal plane of each earthquake
  Examples:	Available at website
  Manual:	Available at website
  Download:	See online documentation

  3D Focal Mechanisms is a tool for viewing earthquake focal mechanism symbols three dimensionally. This tool operates within the Environmental Systems Research Institute (ESRI®) GIS software ArcScene® 9.x. The program requires as input a GIS point dataset of earthquake locations containing strike, dip, and rake values for a nodal plane of each earthquake. Other information, such as depth and magnitude of the earthquake, may also be included in the dataset. By default for each focal point, 3DFM will create a black and white sphere or “beach ball” that is oriented based on the strike, dip, and rake values. If depth values for each earthquake are included, the focal symbol will also be placed at its appropriate location beneath the Earth's surface.

• 3D velocity modeling

  Authors:	Cliff Thurber (most recently modified by Donna Eberhart-Phillips)
  Platform:	Unix
  Other:	arc2cnv.c C code to convert phase data from hypoinverse archive format
  Download:	simulps12.for (197k), simin.tar.Z (79k)

  simulps12.for: Fortran code (VMS compatible) for 3-D velocity model determination and hypocentral location with local earthquake data. Full inversion, not tomography, this is the program written by Cliff Thurber and modified by others (most recently Donna Eberhart-Phillips).

  simin.tar.Z: Example input files for simulps12.for, including the VMS command file. These don't form a complete set that go together, but do show all the different types of input files. This a Unix tar compressed with the Unix compress command.

• cleanstrain+

  

  Author:	John Langbein
  Usage:	Analyze strainmeter data in order to estimate tidal coefficients and pressure admittance
  Platform:	Unix and/or Mac OS X (Requires Fortran compiler for Mac OS X)
  Interface:	Command line
  Input:	Time series of strainmeter data
  Output:	Cleaned-up strainmeter data
  Docs:	Online documentation: installation, manual, examples
  Download:	cleanstrain+

  Cleanstrain+ is a program to process strainmeter data. This code will simultaneously estimate the tidal constituents, pressure admittance, offsets, rate changes, and other terms using least-squares but, importantly, incorporating the temporally correlated nature of strain data (that is, the power spectra is red).

• CLUSTER2000

  

  Author:	Paul Reasenberg
  Usage:	Identify clusters (e.g., aftershocks) in an earthquake catalog
  Platform:	Unix, or any platform with Fortran
  Interface:	Parameters read from standard input
  Input:	Catalog text file
  Output:	Several text files
  Docs:	Comments in source code
  Download:	Fortran source code (35k), Makefile (233b)

  CLUSTER2000 recognizes clusters in space-time in an earthquake catalog. It is intended for use in removing aftershocks or "declustering" the catalog. The methods used are described in "Second-Order Moment of Central California Seismicity, 1969-1982" (P. Reasenberg, JGR v.90., pp.5479-5495, 1985). The current version (CLUSTER2000x) reads catalogs in a variety of standard formats. However, it is not fully Y2000 compatible. While it reads the Y2K formats for HYPOINVERSE and HYPO71, CLUSTER2000x requires all data to belong to one century.

• Coulomb 3

  

  Authors:	Shinji Toda, Ross Stein, Jian Lin, Volkan Sevilgen
  Usage:	Stress-triggering software
  Platform:	Matlab on Windows, Mac or Unix
  Interface:	Menu driven
  Output:	Grahics and text
  Manual:	Online documentaiton
  Download:	See online documentation

  Coulomb 3 is designed to investigate Coulomb stress changes on mapped faults and earthquake nodal planes, and is intended both for publication-directed research and for university teaching and instruction.

  One can calculate static displacements (on any surface or at GPS stations), strains, and stresses caused by fault slip, magmatic intrusion or dike expansion. Problems such as how an earthquake promotes or inhibits failure on nearby faults, or how fault slip or dike expansion will compress a nearby magma chamber, are germane to Coulomb. Geologic deformation associated with strike-slip faults, normal faults, or fault-bend folds is also a useful application. Calculations are made in an elastic halfspace with uniform isotropic elastic properties following Okada [1992].

  We believe that one learns best when one can see the most and can explore alternatives quickly. So the principal feature of Coulomb is ease of input, rapid interactive modification, and intuitive visualization of the results. The program has menus, sub-menus, check-items, and dialogue boxes to ease operation. The internal graphics are suitable for publication, and can be easily imported into illustration or animation programs for further enhancements.

• Earthquake Information Distribution System (EIDS)

  Contacts:	Jeremy Fee and Dave Oppenheimer
  Usage:	Distribution of earthquake data over the Internet
  Platform:	Any O/S that supports Java
  Interface:	Runs in background
  Output:	Files containing information about earthquakes
  Download:	See online documentation

  The Earthquake Information Distribution System (EIDS) provides a method for receiving earthquake data over the Internet in near-real time. EIDS replaces the Quake Data Distribution System (QDDS) and provides either CUBE or EQXML formatted output messages.

• FPFIT, FPPLOT and FPPAGE

  

  Authors:	Paul Reasenberg and David Oppenheimer
  Usage:	Calculate and plotfault-plane solutions from first-motion data
  Platform:	Unix
  Interface:	Command line
  Output:	Grahics and text
  Examples:	Included in dowload file
  Manual:	Online documentation and USGS Open-File report
  Tutorial:	Included in dowload file
  Download:	fpfit_source.tar (1.3 MB)

  FPFIT is a Fortran program that computes double-couple fault plane solutions from P-wave first motion data using a grid search method. The companion programs FPPLOT and FPPAGE plot the results on stereo nets for interactive viewing or for printing. There are additional programs in the package to create summary tables and to plot P&T axes for suites of mechanisms on stereo nets.

• Ground Motion Parameter Calculator

  

  Author:	E.V. Leyendecker, Arthur Frankel, Kenneth Rukstales, Eric Martinez, Nicolas Luco, Jeremy Fee, Ned Field, Nitin Gupta, Vipin Gupta
  Usage:	Calculate estimated ground motions for building design
  Platform:	Any O/S that supports Java
  Interface:	Java Graphic User Interface (GUI)
  Output:	Images and Text
  Download:	See online documentation

  Hazard curves, uniform hazard response spectra, and design parameters are available for sites in the 50 states of the United States, Puerto Rico and the U.S. Virgin Islands. Additionally, design parameters are available for Guam and American Samoa.

• HASH 1.2

  

  Authors:	Jeanne Hardebeck and Peter Shearer
  Usage:	Calculates earthquake focal mechanisms
  Platform:	Unix
  Interface:	Command line / text input files
  Output:	Text files
  Examples:	Included in download file
  Manual:	PDF included in download file
  Download:	hash.v1.2.tar.gz (1 MB)

  HASH is a Fortran 77 code that computes double-couple earthquake focal mechanisms from P-wave first motion polarity observations, and optionally S/P amplitude ratios. HASH is designed to produce stable high-quality focal mechanisms, and tests the solution sensitivity to possible errors in the first-motion input and the computed take-off angles. The technique is described by Hardebeck and Shearer (BSSA 92, pp. 2264-2276, 2002.) Examples are provided for data in FPFIT input format. The code is designed to be as input-format independent as possible, so only minor editing is needed to use data in other formats.

• hypoDD

  

  Author:	Felix Waldhauser
  Maintenance:	Felix Waldhauser, Bruce Julian, Bill Ellsworth, Keith Richards-Dinger
  Usage:	Implements the double-difference earthquake location algorithm
  Platform:	Unix
  Interface:	Command line / text input files
  Output:	Text files
  Examples:	Examples, More examples
  Manual:	PDF and PostScript files in tar file
  Download:	HYPODD_1.0.tar.gz (14 MB)

  HypoDD is a Fortran computer program package for relocating earthquakes with the double-difference (DD) algorithm of Waldhauser and Ellsworth (2000). The DD technique takes advantage of the fact that if the hypocentral separation between two earthquakes is small compared to the event-station distance and the scale length of velocity heterogeneity, then the ray paths between the source region and a common station are similar along almost the entire ray path (Frechet, 1985; Got et al., 1994).

• HYPOINVERSE earthquake location program

  

  Author:	Fred Klein
  Usage:	Locate earthquakes and determine magnitudes in a local or regional seismic network
  Platform:	Unix or Vax, Fortran source code
  Interface:	Command line, files or keyboard
  Input:	ASCII text
  Output:	ASCII text
  Examples:	Sample runs in distribution directory
  Manual:	Extensive open-file document, in Microsoft Word and postscript formats
  Tutorial:	Simple examples included in manual
  Download:	hyp2000 (2 MB)

  HYPOINVERSE2000 determines earthquake locations and magnitudes from seismic network data like first-arrival P and S arrival times, amplitudes and coda durations. The present version HYPOINVERSE2000 is in routine use by the Hawaiian Volcano Observatory, The Northern California Seismic Network, the Nevada network, and many other networks. It is the standard location program supplied with the Earthworm seismic acquisition and processing system and has thus gotten wide use. Crustal models can be multiple to cover different regions, and either flat layer or flat layer with linear velocity gradients. It is Y2000 compatible.

• MacR1D

  

  Author:	Jim Luetgert
  Usage:	1-D travel time calculation
  Platform:	Mac OS 9
  Interface:	Menu driven
  Output:	PICT file
  Download:	MacR1D.zip

  MacR1D is a one-dimensional seismic travel-time calculator for Macintosh. Travel-times vs distance are calculated for P and S arrivals (sorry, no converted phases or multiples) for sources at any depth. These may be compared to observed travel-times. This is a very quick way to define 1-d velocity models from observed arrival pics.

• MacRay

  

  Author:	Jim Luetgert
  Usage:	General purpose 2-D seismic seismic ray tracer
  Platform:	Mac OSX or PC
  Interface:	Menu driven
  Output:	PICT file
  Examples:	Included in download file
  Manual:	MS Word document included in download file
  Download:	Mac OSX - MacRay_V2 (1.9 Mb); PC - RAY84PC (1.2 Mb)

  MacRay is a general purpose two-dimensional seismic ray-tracer for Macintosh. Originally written to trace rays through 2-dimensional p-wave models, MacRay has grown to support 2-d models defined in Vp, Vs and density. In addition to being able to model the full range of simple to complex raypaths, the 2-d gravity response of the model may also be calculated. For surveys providing seismic P, S and converted wave arrivals in addition to gravity measurements, the full suite of physical properties may be modeled; Vp, Vs, density, Poisson's ratio, Vp/Vs, Shear modulus, Bulk modulus, Young's modulus, Lame's parameter, lithostatic pressure.

  With the addition of an assumed or measured geothermal gradient, we can model the pressure and temperature conditions at any point in our earth model. A recent addition to MacRay allows you to define the features of a pressure-temperature diagram (e.g. metamorphic grade, solidus) and map those P-T regions back into the earth model.

  The PC version is a port of Ray84 written for Vax. It was ported by Hans Thybo of Copenhagen University, Denmark.

• OpenSHA

  

  Authors:	Ned (Edward) Field (USGS/SCEC), Nitin Gupta (USC/SCEC), and Vipin Gupta (USC/SCEC)
  Usage:	Open-source seismic hazard analysis
  Platform:	Any O/S that supports Java
  Manual:	See online documentation
  Download:	See online documentation

  OpenSHA is an effort to develop object-oriented, web- & GUI-enabled, open-source, and freely available code for conducting Seismic Hazard Analyses (SHA). Our goal is to provide a framework where any arbitrarily complex (e.g., physics based) earthquake-rupture forecast, ground-motion, or engineering-response model can "plug in" for analysis without having to change what’s being plugged into.

• PQLX

  

  Authors:	Dan McNamara, Richard Boaz
  Usage:	Evaluate seismic station performance
  Platform:	Unix
  Interface:	GUI
  Input:	standard seismic data formats
  Output:	MySQL database, images, plots
  Examples:	See sample data and response file
  Download:	See online documentation

  PQLX is open-source software system for evaluating seismic station performance and data quality. The software consists of a server and client but also includes data extraction and manipulation tools. Given waveform data and instrument response files, PQLX server calculates trace statistics, Power Spectral Densities (PSD), and Probability Density Functions (PDF) and writes the results to a MySQL database for quick access.

• Probabilistic Seismic Hazard Calculation Software

  

  Authors:	Art Frankel and Chuck Mueller
  Usage:	Programs used to construct the 1996 National Seismic Hazard Maps
  Platform:	Unix, Fortran source codes, some C subroutines
  Interface:	command line
  Download:	See online documentation

  Computer codes used to construct the 1996 U.S. National Seismic Hazard Maps.

• Quake Data Distribution System (QDDS)

  

  Contacts:	Dave Oppenheimer
  Usage:	Distribution of earthquake data over the Internet
  Platform:	Any O/S that supports Java
  Interface:	Runs in background
  Output:	Files containing information about earthquakes
  Examples:	Included in dowload file
  Download:	QDDS has been replaced by EIDS

  The Quake Data Distribution System (QDDS) provides a method for distributing earthquake data over the Internet in near-real time using a structure similar to a classical client-server system called a hub-leaf system. Leaves are of two types — transient and permanent. Transient leaves can only receive messages distributed by the hubs. Transient leaves can self-register with the hubs and immediately begin receiving earthquake information. Permanent leaves (i.e., seismic networks) can also originate information and send it to one or more hubs for redistribution to permanent and transient leaves.

  QDDS has been replaced by EIDS

• Quake Data Merge Real Time Merged Catalog (QDM)

  

  Contacts:	Alan Jones and Dave Oppenheimer
  Usage:	Produces a single, merged earthquake catalog using the most authoritative earthquake information
  Platform:	Any O/S that supports Java
  Interface:	Runs in background
  Output:	Files containing information about earthquakes
  Examples:	Included in dowload file
  Download:	See online documentation

  The Quake Data Merge Real Time Merged Catalog (QDM) software receives earthquake summary information and additional text from seismographic networks, eliminates duplicate and redundant information reported by different seismic networks, and produces a single, authoritative earthquake catalog. The process to generate this "composite" catalog follows selection rules set out by the ANSS to determine which earthquake information has the most authoritative information. This catalog can be used as input to other applications that require access to earthquake information in near-real time. The most likely method for receiving the event and text information is through the QDDS system.

• SATSI

  

  Authors:	Jeanne Hardebeck and Andy Michael
  Usage:	Spatially and/or temporally varying stress field from focal mechanisms
  Platform:	Unix (or any platform with C)
  Interface:	Command line / text input files
  Output:	Text files
  Examples:	Included in download file
  Download:	SATSI.tar (360k)

  SATSI (Spatial And Temporal Stress Inversion) is a modified version of Michael's (JGR 1984, 1987) code that inverts focal mechanism data for a spatially and/or temporally varying stress field. The inversion finds the least complex stress field model that is consistent with the data. It uses an adaptive smoothing method that discriminates between variations that are or aren't strongly required by the data and retains only variations that are well-resolved. The technique is described and validated in Hardebeck and Michael (JGR 111, B11310, doi:10.1029/2005JB004144, 2006.) The tar file contains C codes implementing the inversion method for 2D and 4D stress fields (1D and 3D fields can be treated as simplified cases), and example input data and Perl scripts.

• ShakeCast “Lite” – ShakeMap RSS Reader

  

  Authors:	Kuo-Wan Lin and David Wald
  Usage:	Automated ShakeMap delivery to users, facilitating use of ShakeMap products and post-download post-commands (script startup)
  Platform:	Unix, Windows
  Interface:	Scripts / text configuration files
  Output:	ShakeMap products and post-commands (Google Earth, Browser, etc.)
  Examples:	Available at website
  Manual:	Included in download file
  Download:	See online documentation

  Delivers maps of areas affected by an earthquake. Areas of interest can be defined, and shaking thresholds can be set to trigger automatic notifications. Easy to integrate with in-house systems.

• Slick Package

  Author:	Andy Michael
  Usage:	Stress inversion from slip data
  Platform:	Unix, PC (or any platform with C)
  Interface:	Command line, can be run as batch mode
  Bound Program:	Onnet, Stereonet plotting package
  Output:	Text, graphics via onnet stereonet plotting program
  Examples:	Included in download file
  Manual:	ASCII Text and Postscript files in included in download file
  Tutorial:	Included in download file
  Download:	Unix - stress.tar.Z (41k); PC - stresspc.zip (160k)

  The slick package uses fault slip data (either field observations or from focal mechamism) to find the stress tensor that best explains the observations. Inputs are the orientation and slip direction of a set of fault planes. Outputs are the oreintation and shape of the stress ellipsoid, including confidence regions, and statistics used to judge the success of the inversion. This method uses the linear inversion agorithm and non-parametric bootstrap statistics.

  Unix: The code to invert fault slip data for the stress tensor. format is compressed tar. To extract on a Unix system use the command % zcat stress.tar.Z | tar xf - It will expand into a number of files in your current directory. You also need to get the onnet plotting package.

  PC: Same as stress.tar.Z but containing Leigh House of Los Alamos' conversion of the software to PC compatibility. The zip was done with Zip 1.0 (29 September 1991).

• Slope Performance During an Earthquake

  

  Authors:	Randall W. Jibson and Matthew W. Jibson
  Usage:	Using Newmark’s method and simplified decoupled analysis to model slope performance during earthquakes
  Platform:	Any O/S that supports Java
  Interface:	Java GUI
  Manual:	Available in download file
  Download:	See online documentation

  This program package is designed to allow users to conduct Newmark sliding-block analysis and simplified decoupled analysis to estimate co-seismic slope displacements.

• Research Projects
  • Borehole Geophysics and Rock Mechanics
  • Earthquake Geology and Paleoseismology
  • Regional & Whole-Earth Structure
  • Strong-motion Seismology, Site Response & Ground Motion
• Scientific Data
• Software to Download
• External Research Support