Open-Source Seismic Hazard Analysis (OpenSHA)

OpenSHA is an open-source, Java-based platform for conducting Seismic Hazard Analysis (SHA)

As an object-oriented framework, OpenSHA can accomodate arbitrarily complex (e.g., physics based) earthquake rupture forecasts (ERFs), ground-motion models, and engineering-response models, which narrows the gap between cutting-edge geophysics and state-of-the-art hazard and risk evaluations.

Getting Started


Like many open-source projects (see license), OpenSHA is a work in progress. Over twenty years in development, the project has been touched by numerous scientists, developers, and technical experts in the fields of seismology, computer science, and earthquake engineering.

Although primarily focused on California at inception, OpenSHA is now seeing broader, national use via incorporation in the National Sesmic Hazard Mapping (NSHMP) at the USGS, and it is receiving global exposure via the GEM project.

Much of the development of OpenSHA would not have been possible without dedicated financial support of various sponsors.

Contact Us

Please let us know if you encounter any problems with this website, have suggestions for improving it, or would like to suggest or contribute additional content (e.g., tutorials, publications). You can reach the primary developers via e-mail at:

If you are having technical issues with software or have questions specifically relating to the OpenSHA codebase, please see the developer resources page. If you encounter an issue with our applications, submit a ticket here.


If you have trouble viewing content on this website, you may try viewing the content on the Opensha Wiki instead. This website is a mirror of that wiki page, which may be more accessible. Please contact us if we can assist in any way.

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