Complex Ruptures of the 11 April 2011 Mw 6.6 Iwaki Earthquake Triggered by the 11 March 2011 Mw 9.0 Tohoku Earthquake, Japan

Complex Ruptures of the 11 April 2011 Mw 6.6 Iwaki Earthquake Triggered by the 11 March 2011 Mw 9.0 Tohoku Earthquake, Japan
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2011 年 4 月 11 日日本东北 9.0 级地震引发的 2011 年 4 月 11 日 6.6 级磐城地震的复杂破裂

DOI:
10.1785/0120120140
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发表时间:
2013
影响因子:
3
通讯作者:
M. Hashimoto
M. Hashimoto
中科院分区:
地球科学3区
文献类型:
--
作者:
Y. Fukushima;Y. Takada;M. Hashimoto

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摘要2011年3月11日日本东北9.0级地震后,在本州东部福岛县和茨城县交界处的局部地区触发了一系列浅层正断层地震。在这里,我们研究了震群中最大的地震-2011年4月11日Mw和6.6 Iwaki地震的同震位移场和断层模型。对日本ALOS卫星的数据进行雷达干涉测量,发现了与Iwaki地震有关的复杂破裂。特别是,干涉图清楚地显示了沿每条近平行的尤诺达克和伊藤泽断层的多个地表破裂。由干涉图反演得到的这些断裂的滑动分布表明,这些断裂向西倾斜60°-70°,而Itozawa断裂上的滑动在浅层约5公里处延伸为展布断裂。我们的结果表明,在Iwaki地震期间,Itozawa断层以西的高地地区下降了2.4米。在线材料:更大范围内的原始干涉图和反趋势干涉图。
Abstract After the 11 March 2011 M w  9.0 Tohoku earthquake, Japan, a swarm of shallow normal‐faulting earthquakes was triggered in a localized region beneath the border between Fukushima and Ibaraki prefectures in eastern Honshu. Here we examine the coseismic displacement field and a fault model of the largest event of the swarm, the 11 April 2011 M w  6.6 Iwaki earthquake. Radar interferometry applied to data of the Japanese ALOS satellite reveals complex ruptures associated with the Iwaki earthquake. In particular, the interferogram clearly shows multiple surface ruptures along each of the subparallel Yunodake and Itozawa faults. The slip distributions on these faults, as estimated by inverting the interferogram, suggest that the faults dip 60°–70° westward and that slip on the Itozawa fault extended to a splay fault at depths shallower than about 5 km. Our results indicate that the highland area west of the Itozawa fault was downthrown by up to 2.4 m during the Iwaki earthquake. Online Material: Original and de‐trended interferograms over a wider area.
DOI: 10.5047/eps.2011.06.014
发表时间: 2011-09
期刊: Earth, Planets and Space
影响因子: --
作者:
A. Kato;S. Sakai;K. Obara
通讯作者: A. Kato;S. Sakai;K. Obara
DOI: 10.1029/2011gl047834
发表时间: 2011-04
影响因子: 5.2
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DOI: --
发表时间: 2008
期刊: Earth Planets. & Space 60
影响因子: --
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通讯作者: T. Kato
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发表时间: 2009
期刊:
影响因子: --
作者:
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