Computer Program for Seismic Hazard Analysis - A User Manual - (Stanford Seismic Hazard Analysis - STASHA)

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When planning the design of a structure or a facility in a region of potential seismic activity, it becomes necessary to estimate the ground motion intensity to which the structure will be exposed during its economic life. The required information on the site intensity has to be derived using the seismic information available for the region, such as frequency of occurrence of earthquakes, Richter magnitude levels, etc.

Seismic Hazard Models are utilized to obtain the probabilities of the different ground intensity levels at a site. Therefore, the use of an established methodology to perform seismic hazard analysis and hence to synthesize the available seismological information for the purpose of ob­ training a reliable estimate of future seismic loading at a site is necessary.

The principal objective of the current work is that of describing a set of computer programs organized in a consistent way in order to be used to perform seismic hazard analysis at a specified geographic location.

The programs have been developed at Stanford University. They are based on probabilistic seismic risk models discussed in detail by Shah, Mortgat, and Kiremidjian (1975), and Mortgat (1978). They have been utilized for hazard mapping of Nicaragua, Costa Rica, Guatemala, Algeria, offshore Alaska, California, and Honduras (currently in progress) (1, 2, 3, 4, 7).*

The programs constitute a complementary set and are sufficient for the analysis. They are written in FORTRAN IV and have been tested on the Stanford IBM 370/168 computer. Certain programs, such as plotting and mapping routines, are system oriented and can be used only at the Stanford Computer Center.


Type of resource text
Date created January 1984


Author Chiang, W-L
Author Guidi, GA
Author Mortgat, CP
Author Schoof, CC
Author Shah, HC


Subject seismic performance
Subject probabilistic seismic hazard analysis
Subject computer modeling
Genre Technical report

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User agrees that, where applicable, content will not be used to identify or to otherwise infringe the privacy or confidentiality rights of individuals. Content distributed via the Stanford Digital Repository may be subject to additional license and use restrictions applied by the depositor.
This work is licensed under a Creative Commons Attribution 3.0 Unported license (CC BY).

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Preferred Citation
Chiang, W.-L., Guidi, G.A., Mortgat, C.P., Schoof, C.C. and Shah, H.C.. (1984). Computer Program for Seismic Hazard Analysis - A User Manual - (Stanford Seismic Hazard Analysis - STASHA). John A. Blume Earthquake Engineering Center Technical Report 62. Stanford Digital Repository. Available at:


John A. Blume Earthquake Engineering Center Technical Report Series

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