Science Links Japan | Strong Ground Motions during the 1948 Fukui Earthquake. Estimation of Broad-band Ground Motion Using a Hybrid Simulation Technique.

Strong Ground Motions during the 1948 Fukui Earthquake. Estimation of Broad-band Ground Motion Using a Hybrid Simulation Technique.

Accession number;99A0772179

Title;Strong Ground Motions during the 1948 Fukui Earthquake. Estimation of Broad-band Ground Motion Using a Hybrid Simulation Technique.

Author; IRIKURA KOJIRO (Disaster Prev. Res. Inst., Kyoto Univ.) KAMAE KATSUHIRO (Kyoto Univ., Res. Reactor Inst.)

Journal Title;Journal of the Seismological Society of Japan. Second Series

Journal Code:G0931A

ISSN:0037-1114

VOL.52;NO.1;PAGE.129-150(1999)

Figure&Table&Reference;FIG.17, TBL.1, REF.33

Pub. Country;Japan

Language;Japanese

Abstract;We simulate strong ground motions during the 1948 Fukui earthquake with the JMA magnitude 7.1 based on a heterogeneous source model and the hybrid simulation technique. So far there are no existing source models available for simulating strong ground motions from the 1948 Fukui earthquake. Most of the source models have been assumed to have uniform slip distribution on rectangular fault plane. Such models could generate ground motions only available longer than several seconds, underestimating shorter period motions (<1sec) of engineering interest. The objective of this paper is to construct a heterogeneous source model for simulating strong ground motions in a broad period band during the 1948 Fukui earthquake. We assume two source models to examine: Model 1 is a reverse fault model determined from the analysis of geodetic data by YOSHIOKA (1974) and Model 2 is a normal fault model from strong motion displacement data by KIKUCHI et al. (1999). Heterogeneous slip distribution on fault plane is estimated based on the self-similar scaling relationships of seismic moment versus asperity areas and slips by Somerville et al. (1999). Then we obtained the standardized source model consisting of two asperities to have the average characteristics of asperities for the seismic moment of the Fukui earthquake. Relative locations and rupture times of the asperities on the fault plane are determined following the source model by KIKUCHI et al. (1999). The maximum asperity corresponding to the second event in their model has an area of 12*12km2 and slip of 1.7m and is located under the most heavily damaged area along the buried fault, known as the Fukui earthquake fault. The smaller asperity corresponding to the first event is located north of the maximum asperity. Rupture was initiated at the northern edge of the smaller asperity, propagated toward south, then broke to start the maximum asperity 7 seconds after the initial rupture.... (author abst.)

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