The IGS File of Seismic Activity and Its Use for Hazard Assessment

摘要

The Institute of Geological Sciences maintains a file of seismic activity which contains the epicentral parameters of about 135000 different earthquakes. These 135000 different earthquakes are themselves extracted from a larger file which may contain duplicate reports of the same earthquake. The parameters stored for each epicentre include the origin time, geographic coordinates, depth, surface-wave magnitude and the name of the agency reporting the earthquake. These epicentral parameters are ideal for the production of lists and maps for earthquakes in any part of the world. Further, the epicentral parameters facilitate the calculation of expected ground motion associated with each earthquake: it is not a difficult step then to estimate a statistical seismic risk.