ATTENUATION LAWS OF IRANIAN EARTHQUAKES

One of the main elements required for seismic hazard assessment is the attenuation law, specifying the strong ground motion attenuation as a function of earthquake magnitude, site geology and epicentral or hypocentral distance and or distance to the earthquake source (cuasative fault). Peak ground acceleration (PGA) is one of the most important parameters specified by attenuation law. There are several empirical relationships to determine PGA in a given point. Among them the relations offered by Ramazi and Schenk (۱۹۹۴) are extracted by using Iranian strong ground motion data. In this paper it has been tried to review the predicted results and compare them to the real data recorded by Iranian accelerograph network during the recent destructive Iranian earthquakes. Finally, the results are compared to the predicted PGA by a few equations presented by other researchers. It is concluded that the Ramazi and Schenk's attenuation laws have the best fitting to the recent real data