Thrust and Conjugate Strike-Slip Faults in the 17 June 2018 M-JMA 6.1 (M-W 5.5) Osaka, Japan, Earthquake Sequence

Li Yuqiang; Wang Dun; Xu Shenghui; Fang Lihua; Cheng Yifang; Luo Gang; Yan Bing; Bogdan Enescu; Mori Jim

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Thrust and Conjugate Strike-Slip Faults in the 17 June 2018 M-JMA 6.1 (M-W 5.5) Osaka, Japan, Earthquake Sequence

机译：2018年6月17日的推力和共轭防滑故障2018年6月17日M-JMA 6.1（M-W 5.5）大阪，日本，地震序列

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The 17 June 2018 M-JMA 6.1 (M-W 5.5) Osaka earthquake exhibits a large non-double-couple component (similar to 26%), and its aftershock sequence shows a complicated spatial pattern. To better understand the ruptured faults, we relocate the earthquake sequence using P and S arrival times and waveform cross correlations and calculate the focal mechanisms of all M-JMA >= 2.5 (M-W >= 2.3) earthquakes within three months after the mainshock using P-wave first-motion polarities and SIP amplitude ratios. Relocated aftershocks image several faults, the northeast-striking strike-slip fault, the north-northwest-striking reverse fault, and at least two small northwest-striking features. P-wave first motions of the mainshock indicate nearly a pure thrust mechanism. We deduce that the earthquake sequence started from a north-northwest-striking reverse fault and propagated to a northeast-striking strike-slip fault. The aligned strikeslip aftershocks occurring in the vicinity of the northeast-striking strike-slip fault delineates the growth of several newly formed or reactivated northwest-striking Riedel shears that are conjugated to the northeast-striking strike-slip fault.

机译：2018年6月17日M-JMA 6.1（M-W 5.5）大阪地震表现出大型非双夫妇组分（类似于26％），其余震序列显示了复杂的空间图案。为了更好地理解破裂的故障，我们使用P和S到达时间和波形交叉相关性重新定位地震序列，并计算所有M-JMA> = 2.5（MW> = 2.3）地震的焦点机制在主座3个月内使用P的三个月内地震 - 波的第一运动极性和SIP振幅比。重新安置余震图像几个断层，东北罢工的防滑断层，北非西北引人注目的逆端，而且至少有两个小型西北醒目的功能。主轴的P波的第一动作表示几乎是纯推力机制。我们推断出地震序列从北北 - 西北引人注目的逆端故障开始，并传播到东北罢工滑动故障。在东北引人注目的防滑断层附近发生的对齐的斯特克雷希普血液发生，描绘了几种新形成或重新激活的西北部击打的Riedel剪剪，其与东北引人注目的防滑故障结合。

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来源
《Seismological research letters》 |2019年第6期|共10页
作者
Li Yuqiang; Wang Dun; Xu Shenghui; Fang Lihua; Cheng Yifang; Luo Gang; Yan Bing; Bogdan Enescu; Mori Jim;
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作者单位

China Univ Geosci Sch Earth Sci State Key Lab Geol Proc &

Mineral Resources 388 Lumo Rd Wuhan 430074 Hubei Peoples R China;

China Univ Geosci Sch Earth Sci State Key Lab Geol Proc &

Mineral Resources 388 Lumo Rd Wuhan 430074 Hubei Peoples R China;

China Univ Geosci Sch Earth Sci State Key Lab Geol Proc &

Mineral Resources 388 Lumo Rd Wuhan 430074 Hubei Peoples R China;

China Earthquake Adm Inst Geophys 5 Minzudaxue Nanlu Beijing 100081 Peoples R China;

Univ Southern Calif Dept Earth Sci 850 West 37th St Los Angeles CA 90089 USA;

Wuhan Univ Sch Geodesy &

Geomat 129 Luoyu Rd Wuhan 430079 Hubei Peoples R China;

Hohai Univ Coll Oceanog 1 Xikang Rd Nanjing 210098 Jiangsu Peoples R China;

Kyoto Univ Fac Sci Dept Geophys Sakyo Ku Kitashirakawa Oiwake Cho Kyoto 6068502 Japan;

Kyoto Univ Disaster Prevent Res Inst Uji Kyoto 6110011 Japan;

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正文语种 eng
中图分类地震学;
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Thrust and Conjugate Strike-Slip Faults in the 17 June 2018 M-JMA 6.1 (M-W 5.5) Osaka, Japan, Earthquake Sequence

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