Abstract
More than 200 strong ground motions were observed during the 17 January 1995 Hyogoken-Nambu earthquake over a wide variety of subsurface ground conditions including rock and stiff or soft soils. Key parameters of the records, such as peak ground acceleration values (PGAs), were immeadiately published by many organizations, such as CEORKA (the Committee of Earthquake Observation and Research in the Kansai Area), JMA (the Japan Meteorological Agency), PWRI (the Public Works Research Institute, Ministry of Construction), PHRI (the Port and Harbour Research Institute, Ministry of Transport), RTRI (Railway Technical Research Institute, Japan Railway Companies), the Kansai Electric Power Co., Osaka Gas Co. and others. This paper presents a preliminary overview of strong ground motion characteristics using these records especially focussing on peak ground acceleration. The main results of this study are that (1) S wave radiation from strike slip fault can explain the regional distribution of PHGAs during this event, (2) High PGAs observed in the strike direction area have been strongly affected by the directivity effect and (3) The unusually small PHGA/PVGA ratios near the fault rupture zone have resulted from the strong nonlinearlity of the subsurface soils.
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