COMPARISON BETWEEN RECORDED AND DERIVED HORIZONTAL PEAK GROUND ACCELERATIONS IN JORDAN

The isoseismal map for the earthquake that occurred in the Jordan Vall ey on 11 July 1927 was analyzed and used to develop Peak Ground Accele ration (PGA) Attenuation relation for Jordan needed for use in relevan t seismic hazard evaluation procedures. Strong motion data of earthqua kes that occurred in Jordan and Israel during the last 15 years were s ummarized. A comparison is made between recorded PGA's and those calcu lated using the derived Attenuation relations commonly used by experts in the region. The comparison showed that the derived relation is app ropriate for estimating PGA values on alluvium foundations. The derive d relation gave results close to those obtained using a relation intro duced by Esteva in 1974. The 1982 relation of Ben-Menahem and coworker s gave reasonable predictions of PGA values for most geological format ions of foundations, in general.