33. Seismic risk related programs

This section is written by M. B. Sørensen, based on a previous version by K. Atakan. Extensive testing of the programs was done over the years by many users.

Introduction

Currently, the SEISAN package includes a series of stand-alone programs and Seisan Explorer (SE) functions that can be used in a number of tasks that are needed to perform seismic hazard analysis. The basic requirements for performing a probabilistic seismic hazard analysis (PSHA) may be summarized as follows:

• Collect the best possible earthquake catalog for the study area.
• Homogenize the earthquake catalogue and assess the completeness.
• Define the seismic source zones.
• Prepare input parameters from the earthquake catalogue for each source zone.
• Define ground motion prediction equations (GMPE) for the region.
• Compute hazard in terms of different ground motion parameters (e.g., peak ground acceleration (PGA), peak ground velocity (PGV) or spectral acceleration (SA) at different periods).
• Assess site effects.
• Prepare response spectra.