Rupture process of the 1948 Fukui earthquake (M 7.1) from the joint inversion of seismic waveform and geodetic data
Rupture process of the 1948 Fukui earthquake (M 7.1) from the joint inversion of seismic waveform and geodetic data
复制标题
地震波形与大地测量数据联合反演1948年福井地震(M 7.1)的破裂过程
DOI:
10.1029/2004jb003437
复制
发表时间:
2005
影响因子:
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通讯作者:
Toshiaki Sato
中科院分区:
文献类型:
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作者:
G. Ichinose;P. Somerville;H. Thio;S. Matsushima;Toshiaki Sato
[1] We used teleseismic body waves, regional low-gain strong motion seismograms, and horizontal geodetic displacements from triangulation surveys to invert for the slip distribution of the 1948 Fukui, Japan, earthquake using the multiple time window method. The earthquake ruptured unilaterally from a depth of 10 km to the north with very little slip (0–0.5 m) evenly distributed across a fault of 24 by 18 km over a period of about 10 s. At 9 s after the initiation of rupture, an adjacent fault along the same strike ruptured to the south from the hypocenter to about 20–30 km toward Fukui city mostly along a shallow asperity between 0 and 12 km depth. The large amount of shallow slip (1–1.5 m) below and within the sedimentary basin and strong rupture directivity likely contributed to the high amount of damage in Fukui city. We obtain a total seismic moment of 1.6–2.2 × 1026 dyn cm (Mw 6.74–6.84) which is similar to results by Kanamori (1973), Sagiya (1999), and Kikuchi et al. (1999) using portions of the same regional strong motion and geodetic data sets. We needed to use very low rupture velocities (1.5 km/s) and a hypocenter 10–20 km north of the original location to fit the combined geodetic and seismic data sets with a single fault model. We developed an alternative fault model with two segments allowing for different rupture dynamics for each segment. This resulted in a slightly better fit to the data and allows for a more reasonable rupture velocity up to 2.4 km/s.
DOI:
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发表时间:
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期刊:
影响因子:
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作者:
通讯作者:
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DOI:
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发表时间:
2009
期刊:
影响因子:
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作者:
Choong Geun Lee;V. G. Moshnyaga and K. Hashimoto;宮田康治
通讯作者:
宮田康治