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Links to Online Software

(To download, PC users should right-click and choose "Save Target As...")

Users should be aware of the following disclaimer: Although these programs have been used by the U.S. Geological Survey, no warranty, expressed or implied, is made by the USGS as to the accuracy and functioning of the programs and related program material, nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.

The disclaimer applies even more than usual to these programs. The programs are part of evolving packages and are provided solely for the convenience of the user. I would like to hear about bugs, but please do not ask me for software support.

SMSIM (Stochastic-Method SIMulation)

Updated 01 March 2009; the main addition is a batch version of site_amp and batch versions of the SMSIM TMRS programs that calculate effective distance for a finite fault before doing the simulations (see my recent paper on this subject added to the online publications page), The TMRS programs are batch programs that compute motions for a list of sets of damping, period, distance, magnitude, and stress.

For SMSIM, download the Read Me File file (19 Kb), the Manual [Note: The manual has not been updated to incorporate the latest changes, but most things in the existing manual are OK. I advise looking at the readme.txt file and the text headers at the beginning of the Fortran source code for more up-to-date information] (1.1 Mb), the zip files containing Strong-Motion Simulation Software (5.0 Mb) and Site Amplification Software (2.4 Mb).

For the convenience of the user, I include my version of EXSIM (see my paper "Comparing stochastic point-source and finite-source ground-motion simulations: SMSIM and EXSIM" as well as the comments in the source code to see what modifications I have made to EXSIM); please note that including this program here does not imply my endorsement of the program as the best way to simulate motions from finite faults, particularly at intermediate and long periods. I think that the broadband hybrid methods being developed by numerous authors are better suited for such simulations. For EXSIM_DMB, download the main program source code, the source code for additional subroutines, and the input parameter file. [A revision on 24 June 2009, primarily involving some slight changes to the parameter file.]