The Significance of Tomographic Edge Zones for Large Earthquakes in Taiwan
文献类型：期刊论文
| 作者 | Wang, Z.; Kao, H. |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2019 |
| 卷号 | 124期号:11页码:11822 |
| 关键词 | multiparameter imaging tomographic edge zone seismogenesis of large earthquake Taiwan subduction zone |
| DOI | 10.1029/2019JB017875 |
| 英文摘要 | Seismogenesis of large earthquakes in Taiwan are often controlled by regional tectonics. Despite decades of efforts, the detailed relationship between seismogenesis of disastrous earthquakes and the geophysical properties of the earth materials remains unclear. In this study, we conduct high-resolution tomography inversion of seismic velocities (V-p and V-s) and the Poisson's ratio (sigma), and the results are used to infer the three-dimensional (3-D) distributions of crack density (epsilon) and saturation rate (zeta). We find that more than 70% of large (moment or local magnitudes >= 6, M6+) earthquakes occurred along tomographic edge zones (TEZ) within the crust where the spatial gradient exceeds 0.1, including all three disastrous events in the past two decades: the 1999 M7.6 Chi-Chi, 2016 M6.5 Meinung, and the 2018 M6.4 Hualien earthquakes. We attribute the preference of large crustal earthquakes along TEZ as the consequence of fluid migration from the more saturated side to the opposite, leading to the build-up of high pore pressure along TEZ. Locations of historical M6+ earthquakes are consistent with the inference of excessive fluids from either the extensive dehydration of hydrous minerals within the subducting Philippine Sea plate or the sedimentary compaction of alluvium and clastic deposits in the foreland basin west of the orogenic belt. Positive correlation between M6+ earthquakes and TEZ is not unique to Taiwan. Several famous earthquakes in regions with different tectonic settings appear to be associated with local TEZ. Our study could provide insights to long-term mitigation of regional seismic hazards in Taiwan and probably elsewhere. |
| 资助机构 | Foundation of Global Changing and Air-Sea Interaction [GASI-GEOGE-0502]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41572201]; Public Safety Geoscience Program of NRCan; NSERCNatural Sciences and Engineering Research Council of Canada ; Foundation of Global Changing and Air-Sea Interaction [GASI-GEOGE-0502]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41572201]; Public Safety Geoscience Program of NRCan; NSERCNatural Sciences and Engineering Research Council of Canada |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18249]  |
| 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, Z.,Kao, H.. The Significance of Tomographic Edge Zones for Large Earthquakes in Taiwan[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019,124(11):11822, 11839. |
| APA | Wang, Z.,&Kao, H..(2019).The Significance of Tomographic Edge Zones for Large Earthquakes in Taiwan.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,124(11),11822. |
| MLA | Wang, Z.,et al."The Significance of Tomographic Edge Zones for Large Earthquakes in Taiwan".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 124.11(2019):11822. |
入库方式： OAI收割
来源：南海海洋研究所
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