Saint Louis University Earthquake Center

Computer Programs in Seismology

Introduction

With the installation of a PDP 11/70 minicomputer in 1981 for use in seismic network analysis, a persistent effort was made to use that tool for research. Because of the uniqueness of a dedicated minicimputer for research at that time as well as a desire to do something for the world wide seismological community, a set of documented computer programs emerged. The programs developed actually reflect research interests of the department as well as a desire to look at data in the manner of other investigators. In doing so, the hope is that these tools will permit research to progress rapidly.

This programming effort led to the development of COMPUTER PROGRAMS IN SEISMOLOGY which continues to be distributed. The package contains its own graphics package, and is relatively easy to install.

  • Version 2.0 emphasized the development of algorithms.
  • Version 3.0 (NEW) emphasizes ease of use. Version 3.30 is the latest release.

Computer Programs in Seismology

These programs focus on the understanding and interpretation of seismic wave propagation in the crust and upper mantle of the Earth. Synthetic seismograph code is provided for sources and receivers at arbitrary positions in the plane layered media. Programs are provided for determination of crustal structure through the inversion of surface-wave dispersion and teleseismic P-wave receiver functions. Inversion of broadband recordings of regional earthquakes for source depth, focal mechanism and seismic moment is also provided. Finally, a new tool, gsac, is provided to permit interactive and script based manipulation of seismic traces. The entire package is well integrated in that the same Earth velocity model, waveform and graphics formats are used by all programs. A complete interactive graphics package is also provided.

Since this package of programs continues to develop and be refined  to keep current with increasing volumes of digital might wish to  return to this page every few months.

Platforms

The present code requires the use of the gcc/gfortran compilers that are available for all platforms. Interactive graphics requires X11 graphics.

PC Versions Currently support for PC's running windows requires the CYGWIN environment (http://www.cygwin.com). The source codes and installation procedure are the same as for the UNIX/LINUX/OSX versions.

UNIX/LINUX/OSX Versions Source codes and install scripts are available. C and FORTRAN compilers are required - gcc and gfortran are available for free. Programs are distributed as gzip'd tar files (.tgz). Documentation in PostScript is provided.

Ubuntu Linux

You can use the program download page, or open a terminal window and enter the following commands: 

sudo apt-get install gfortran
sudo apt-get install xorg-dev
sudo apt-get install libncurses5-dev

the following programs are useful: 

sudo apt-get install gv
sudo apt-get install graphicsmagick

RHEL 6.3 Linux (perhaps Fedora)

You can use the Add/Remove Softare tab, or open a terminal window and enter the following commands: 

yum install gfortran
yum install libX11-devel
yum install ncurses-devel

the following programs are useful: 

yum install gv
yum install ImageMagick

Support

If you have any questions or if you have suggestions for additions to the package, please Email rbh@eas.slu.edu.

You can find more information about the Center, seismology, and many other earthquake-related topics by visiting the Center's homepage, or by contacting Dr. Robert Herrmann.

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