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Structural features and seismotectonic implications of coseismic surface ruptures produced by the 2016 Mw 7.1 Kumamoto earthquake.
Journal of Seismology ( IF 1.6 ) Pub Date : 2017-03-21 , DOI: 10.1007/s10950-017-9653-5
Aiming Lin 1
Affiliation  

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.

中文翻译:

2016年熊本Mw 7.1地震产生的同震表面破裂的结构特征和地震构造意义。

实地调查和卫星图像和航拍照片的分析显示,2016年中号 w ^7.1(Mj 7.3)熊本地震在日本九州中部岛产生了一个约40公里的表面破裂带,撞击NE-SW。同震面破裂的特征是剪切断层,伸展裂缝和and陷,主要发生在西南部和中部段早先存在的NE-SW撞击的Hinagu-Futagawa断层带,以及东北部段新发现的断层。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,现场实测最大位移达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1.75 m,较小的水平分量在阿苏火山口内部形成了structures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。2016年中号 W¯¯因此7.1级地震熊本提供了一个难得的学习机会阿苏火山的地震构造同震破裂过程和预先存在的活动断层之间的关系,以及。
更新日期:2017-03-21
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