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Structural features and seismotectonic implications of coseismic surface ruptures produced by the 2016 Mw 7.1 Kumamoto earthquake

机译:2016年熊本7.1级地震产生的同震表面破裂的结构特征和地震构造意义

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摘要

Field investigations and analyses of satellite images and aerial photographs reveal that the 2016 M w 7.1 (Mj 7.3) Kumamoto earthquake produced a ∼40-km surface rupture zone striking NE-SW on central Kyushu Island, Japan. Coseismic surface ruptures were characterized by shear faults, extensional cracks, and mole tracks, which mostly occurred along the pre-existing NE-SW-striking Hinagu–Futagawa fault zone in the southwest and central segments, and newly identified faults in the northeast segment. This study shows that (i) the Hinagu–Futagawa fault zone triggered the 2016 Kumamoto earthquake and controlled the spatial distribution of coseismic surface ruptures; (ii) the southwest and central segments were dominated by right-lateral strike-slip movement with a maximum in-site measured displacement of up to 2.5 m, accompanied by a minor vertical component. In contrast, the northeast segment was dominated by normal faulting with a maximum vertical offset of up to 1.75 m with a minor horizontal component that formed graben structures inside Aso caldera; (iii) coseismic rupturing initiated at the jog area between the Hinagu and Futagawa faults, then propagated northeastward into Aso caldera, where it terminated. The 2016 M w 7.1 Kumamoto earthquake therefore offers a rare opportunity to study the relationships between coseismic rupture processes and pre-existing active faults, as well as the seismotectonics of Aso volcano.Electronic supplementary materialThe online version of this article (doi:10.1007/s10950-017-9653-5) contains supplementary material, which is available to authorized users.
机译:对卫星图像和航拍照片的现场调查和分析表明,2016年熊本M 7.1(Mj 7.3)地震在日本九州岛中部产生了一个NE-SW〜40 km的地表破裂带。同震面破裂的特征是剪切断裂,伸展裂缝和,陷,主要发生在西南和中部早先存在的NE-SW撞击的Hinagu-Futagawa断裂带,以及东北部新发现的断裂。这项研究表明:(i)Hinagu–Futagawa断裂带引发了2016年的熊本地震,并控制了同震表面破裂的空间分布; (ii)西南和中部地区以右侧走滑运动为主,最大实测位移最大为2.5 m,并伴有较小的垂直分量。相比之下,东北段以正断层为主导,最大垂直偏移最大为1.75m,水平分量较小,在阿苏火山口内部形成了grab陷结构。 (iii)在Hinagu和Futagawa断层之间的缓动区开始的同震破裂,然后向东北传播到Aso破火山口,并在此终止。因此,2016年熊本7.1级地震为研究同震破裂过程与既有活动断层之间的关系以及阿苏火山的地震构造提供了难得的机会。电子补充材料本文的在线版本(doi:10.1007 / s10950) -017-9653-5)包含补充材料,授权用户可以使用。

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