Multi-parameter imaging in the 2016 Mw 7.0 Kumamoto earthquake, Kyushu, Japan and its implications for fluids in seismogenesis
文献类型：期刊论文
| 作者 | Wang, Zhi |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2019 |
| 卷号 | 767页码:UNSP 228162 |
| 关键词 | 2016 Mw7.0 Kumamoto earthquake Unzen and Aso Volcanisms Fluid penetration Extensional rift zone Multi-parameter tomography |
| DOI | 10.1016/j.tecto.2019.228162 |
| 英文摘要 | Fluids associated with structural heterogeneities in a seismogenic layer play a crucial role in triggering earthquakes and controlling their rupture processes, but the mechanism of fluid intrusion and the relationship with earthquake initiation are unclear. This study presents new seismic evidence of an earthquake mostly triggered by fluid intrusion associated with magmatism in Kyushu, SW Japan. Seismic imaging revealed two zones with slow seismic velocities beneath the Unzen and Aso Volcanoes with high Poisson's ratio, extending into the rupture belt of the 2016 Mw 7.0 Kumamoto earthquake. The following features, particularly the high Poisson's ratio anomalies, suggest the presence of fluids in the source area ascending from nearby magmatism. Anomalous crack density and saturation rate imply that the fractures/pores are not fully saturated with fluids in the crust of the Beppu-Shimabara Graben, possibly providing a path for fluids to penetrate into the source area, either through highly fracture-damaged faults or via incompletely saturated pores/cracks. Fluid penetrating into the hypocenter areas from deep magma increases the pore pressure and decreases the Coulomb failure function. We therefore speculate that a system such as this, with high pore pressure and fluids in the host faults might lower the threshold for fault failure, thus increasing the likelihood of failure of the mainshock fault. The results of this study suggest that the presence of fractures/pores within extensional rift zones around the world might be critical for fluid migration, and contribute to the initiation, development and migration of seismic activity. |
| 资助机构 | foundation of Global Changing and Air-Sea Interaction [GASI-GEOGE-05-02]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41572201, 41372229]; One Hundred Person Project of the Chinese Academy of Sciences [17314059] ; foundation of Global Changing and Air-Sea Interaction [GASI-GEOGE-05-02]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41572201, 41372229]; One Hundred Person Project of the Chinese Academy of Sciences [17314059] |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18269]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 推荐引用方式 GB/T 7714 | Wang, Zhi. Multi-parameter imaging in the 2016 Mw 7.0 Kumamoto earthquake, Kyushu, Japan and its implications for fluids in seismogenesis[J]. TECTONOPHYSICS,2019,767:UNSP 228162. |
| APA | Wang, Zhi.(2019).Multi-parameter imaging in the 2016 Mw 7.0 Kumamoto earthquake, Kyushu, Japan and its implications for fluids in seismogenesis.TECTONOPHYSICS,767,UNSP 228162. |
| MLA | Wang, Zhi."Multi-parameter imaging in the 2016 Mw 7.0 Kumamoto earthquake, Kyushu, Japan and its implications for fluids in seismogenesis".TECTONOPHYSICS 767(2019):UNSP 228162. |
入库方式： OAI收割
来源：南海海洋研究所
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