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
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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
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发表时间:
2005
影响因子:
--
通讯作者:
Toshiaki Sato
Toshiaki Sato
中科院分区:
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文献类型:
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作者:
G. Ichinose;P. Somerville;H. Thio;S. Matsushima;Toshiaki Sato

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[1]我们使用的地震体波,区域低增益强震地震图,和水平大地测量位移三角测量反演的滑移分布的1948年福井,日本,地震使用多时间窗方法。地震从10公里深处向北单侧破裂,在大约10秒的时间内,几乎没有滑动(0-0.5米)均匀分布在24 × 18公里的断层上。在破裂开始后9 s,一个相邻的断层沿着同一走向从震源向南破裂到福井市约20-30 km,主要是沿着0 - 12 km深度之间的浅凹凸体。沉积盆地内和沉积盆地下方的大量浅层滑动(1-1.5 m)和强烈的破裂方向性可能是造成福井市大量破坏的原因。我们得到的总地震矩为1.6-2.2 × 1026 dyn cm(Mw 6.74-6.84),这与Kanamori(1973),Sagiya(1999),和菊池等人(1999)利用部分相同的区域强震和大地测量数据得到的结果相似。我们需要使用非常低的破裂速度(1.5 km/s)和震源在原始位置以北10-20 km处,以将大地测量和地震数据集与单一断层模型相结合。我们开发了一个替代故障模型,两个部分允许不同的破裂动力学为每个部分。这导致了对数据的稍微更好的拟合,并允许更合理的破裂速度高达2.4 km/s。
[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.
Sawada, Y.:“日本西南部山阴地区白垩纪至中新世火成岩的 Nd-Sr 系统学。”
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发表时间: 2009
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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