Estimation of Strong Ground Motions based on the Arerage Characteristics of Accelerograms Recorded on Hard Ground

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This paper describes average strong ground motions and estimation ofstrong motion at tipical alluvial deposits. Data-base for the study in-clude four kinds of data-set. Espcially, data-set of California, Mexico and Cile is mainly used for the study. Acceleration records of horizon-tal components are 388 during 18 earthquakes. These accelererograms are recorded on the ground surface of hard soil layrs. Several attenuation curves of maximum acceleration Amax and maximum velocity Vmax are dis-cussed each other.Using the data-set of California, Mexico and Chele, the average ground-motion stregth, response spectra and standard deviation are clarified. Two kind of strong motion are evaluated. One of them is a earthquake of magnitude M8.0 and hypocentral distance X=52.5km for Kato earthquake and the other is M7.6, X=33km for Kansai district. Strong-motion at the top of deep alluvial deposit and moderate depth deposit are estimated in Tokyo and Osaka respectively.These results are compared with the ground motions durion the Hyogoken Nanbu earthquake in January of 1995. Amax due to the earthquake is same level forthe estimated Amax, but Vmax of the earthquake is tweice of the estimated average velocity.