Stress Drops of Intermediate-Depth and Deep Earthquakes in the Tonga Slab
文献类型：期刊论文
| 作者 | Tian, Dongdong1,2; Wei, S. Shawn1; Wang, Wei3,4; Wang, Fan1 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2022-10-01 |
| 卷号 | 127期号:10页码:23 |
| ISSN号 | 2169-9313 |
| 关键词 | intermediate-depth and deep earthquakes Tonga subduction zone fluid-related embrittlement source spectra stress drops double seismic zone |
| DOI | 10.1029/2022JB025109 |
| 英文摘要 | Multiple physical mechanisms have been proposed to explain the cause of intermediate-depth and deep earthquakes, but they are still under debate. Source parameters such as stress drop, have the potential to provide insight into their physical mechanisms. We develop a modified spectral decomposition method to analyze 1-year seismic data from temporary land-based and ocean bottom seismographs in a complex subduction zone. By applying this method to investigate 1,083 intermediate-depth and deep earthquakes in the Tonga slab, we successfully resolve the source spectra and stress drops of 743 M-W 2.6-6.0 earthquakes. Although the absolute stress drops are subject to the choices of source model parameters, the relative stress drops are more reliably resolved. The median stress drop of Tonga earthquakes does not change with respect to magnitude but decreases with depth by 2-3 times in two separate depth ranges of 70-250 and 400-600 km, corresponding to intermediate-depth and deep earthquakes, respectively. The median stress drops show spatial variations, with two high-stress-drop (five times higher than the ambient value) regions, coinciding with strong local deformation where the Tonga slab bends or tears. In the Tonga double seismic zone at 120-300 km depths, the median stress drop appears smaller in the lower plane than in the upper plane, suggesting a slower rupture velocity or a higher fluid content in the lower-plane region. Our results suggest that intermediate-depth and deep earthquakes in the Tonga slab generally follow the earthquake self-similar model and favor the fluid-related embrittlement hypothesis for both groups of earthquakes. |
| WOS关键词 | DOUBLE SEISMIC ZONE ; SOURCE PARAMETERS ; REPEATING EARTHQUAKES ; RADIATION EFFICIENCY ; PHYSICAL-MECHANISM ; WAVE ATTENUATION ; HIGH-PRESSURE ; RUPTURE ; JAPAN ; FAULT |
| 资助项目 | NSF[OCE-1842989] ; NSF[EAR-2042553] ; MSU Geological Sciences Endowment ; "CUG Scholar" Scientific Research Funds at China University of Geosciences (Wuhan)[2022012] ; Key Research Program of the Institute of Geology and Geophysics, CAS[IGGCAS-201904] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:000865978000001 |
| 资助机构 | NSF ; NSF ; MSU Geological Sciences Endowment ; MSU Geological Sciences Endowment ; "CUG Scholar" Scientific Research Funds at China University of Geosciences (Wuhan) ; "CUG Scholar" Scientific Research Funds at China University of Geosciences (Wuhan) ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; NSF ; NSF ; MSU Geological Sciences Endowment ; MSU Geological Sciences Endowment ; "CUG Scholar" Scientific Research Funds at China University of Geosciences (Wuhan) ; "CUG Scholar" Scientific Research Funds at China University of Geosciences (Wuhan) ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; NSF ; NSF ; MSU Geological Sciences Endowment ; MSU Geological Sciences Endowment ; "CUG Scholar" Scientific Research Funds at China University of Geosciences (Wuhan) ; "CUG Scholar" Scientific Research Funds at China University of Geosciences (Wuhan) ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; NSF ; NSF ; MSU Geological Sciences Endowment ; MSU Geological Sciences Endowment ; "CUG Scholar" Scientific Research Funds at China University of Geosciences (Wuhan) ; "CUG Scholar" Scientific Research Funds at China University of Geosciences (Wuhan) ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/107809]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 通讯作者 | Tian, Dongdong; Wei, S. Shawn |
| 作者单位 | 1.Michigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA 2.China Univ Geosci, Inst Geophys & Geomat, Wuhan, Hubei, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China 4.Univ Southern Calif, Dept Earth Sci, Los Angeles, CA 90007 USA |
| 推荐引用方式 GB/T 7714 | Tian, Dongdong,Wei, S. Shawn,Wang, Wei,et al. Stress Drops of Intermediate-Depth and Deep Earthquakes in the Tonga Slab[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2022,127(10):23. |
| APA | Tian, Dongdong,Wei, S. Shawn,Wang, Wei,&Wang, Fan.(2022).Stress Drops of Intermediate-Depth and Deep Earthquakes in the Tonga Slab.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,127(10),23. |
| MLA | Tian, Dongdong,et al."Stress Drops of Intermediate-Depth and Deep Earthquakes in the Tonga Slab".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 127.10(2022):23. |
入库方式： OAI收割
来源：地质与地球物理研究所
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