Source Parameters of the 1948 Fukui Earthquake Inferred from Low-gain Strong-motion Records.
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Accession number;99A0772178
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| Title;Source Parameters of the 1948 Fukui Earthquake Inferred from Low-gain Strong-motion Records. |
| Author;
KIKUCHI MASAYUKI
(Univ. of Tokyo, Earthq. Res. Inst.)
NAKAMURA MISAO
(Bousaijohosabisu)
YAMADA MAKOTO
(Advanced Res. Center for Sci. and Engineering, Waseda Univ.)
FUSHIMI MINORU
(Kansai Electr. Power Co., Inc.)
TATSUMI YOSHIKI
(Kansai Electr. Power Co., Inc.)
YOSHIKAWA KAZUMITSU
(Minist. of Transp. Meteorol. Agency)
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Journal Title;Journal of the Seismological Society of Japan. Second Series
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Journal Code:G0931A
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ISSN:0037-1114
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VOL.52;NO.1;PAGE.121-128(1999)
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| Figure&Table&Reference;FIG.6, TBL.2, REF.14 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Seismograms in 1940's are usually recorded on smoked paper. Owing to the recent development of photocopy and image processing techniques, we can reconstruct feasible waveform data by tracing, digitizing, and correcting the arc effect due to inclined lever. Using low gain strong motion data at several observatories of Japan Meteorological Agency and Kyoto University, we investigate the source process of the 1948 Fukui earthquake. In the waveform inversion we consider the uncertainty of instrumental constants (pendulum period, magnification and damping constant), timing, and chart speed. The rupture process is then modeled by moment-rate functions at grid points on a fault plane with a spacing of 10km. It is shown that a rupture initiated at a depth of about 10km, moved upward, and then propagated mainly to the south. The rupture front velocity was about 2.5km/s. The largest moment release occurred around 10km south of the epicenter. The main source parameters are: strike=170.+-.5.DEG., dip=70.+-.5.DEG., rake=-10.+-.10.DEG., seismic moment=2.1*1019Nm, Mw=6.8, fault area=30*10km2, average dislocation=2.3m, stress drop=10MPa. (author abst.) |
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