Seismotectonics and fault geometries of the Qinghai Madoi M(s)7. 4 earthquake sequence: Insight from aftershock relocations and focal mechanism solutions
文献类型：期刊论文
| 作者 | Zhang JianYong1,2; Wang Xin3,4; Chen Ling2,4; Liu Jie1 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2022-02-01 |
| 卷号 | 65期号:2页码:552-562 |
| 关键词 | Madoi M(s)7. 4 earthquake Double-difference location Focal mechanism solutions Seismotectonics Fault geometries |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg2022P0516 |
| 英文摘要 | The 2021 M(s)7. 4 Madoi earthquake occurred in Madoi county, Guoluo Prefecture, Qinghai Province at 02:04 (Beijing Time) on 22 May followed by notable aftershocks. Geological surveys and satellite observations provide important constraints on the surface traces of faulting. However, the subsurface fault geometries, which are important for understanding the regional stress field, earthquake initiation, propagation, and termination, are not well resolved. In this study, the double-difference earthquake location algorithm was employed to relocate the aftershocks within the first 25 days. The aftershocks mostly lie along a narrow compact straight strip, the Jiangcuo Fault, stretching NWW of the M(s)7. 4 hypocenter, indicating that the mainshock ruptured bilaterally with a total length of similar to 170 km. To the east and west ends of rupture zone, the aftershocks bifurcates, indicating the complex geometry of the fault zone structure. The focal mechanism solutions of 132 aftershocks in the Madoi source area were obtained by the waveform inversion method and the P-wave first motion polarity inversion method. The focal mechanism solutions show that the mainshock occurred on a left-lateral strike-slip fault and the focal mechanism of the aftershocks is similar to that of the mainshock. Stress inversion shows that the maximum compressive stress is orientated about N60 degrees E. The depth of aftershocks is mainly concentrated in 10 similar to 12 km. There are few shallow aftershocks, indicating that the stress may be largely released by the mainshock at shallow depth. Therefore, the depth distribution of aftershocks may limit the lower boundary of coseismic rupture of the mainshock. The rupture of the Madoi mainshock started at the location where the strike and tendency of the fault changed significantly, indicating the fault plane geometrical complexities may represent a favored site for the M(s)7. 4 event nucleation. There are multiple branches of faults at both ends of the mainshock rupture, indicating the fault geometric complex plays an important role in earthquake termination. |
| WOS关键词 | INVERSION ; REGION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000776144900010 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/105044]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 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 | Wang Xin |
| 作者单位 | 1.China Earthquake Networks Ctr, Beijing 100045, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang JianYong,Wang Xin,Chen Ling,et al. Seismotectonics and fault geometries of the Qinghai Madoi M(s)7. 4 earthquake sequence: Insight from aftershock relocations and focal mechanism solutions[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2022,65(2):552-562. |
| APA | Zhang JianYong,Wang Xin,Chen Ling,&Liu Jie.(2022).Seismotectonics and fault geometries of the Qinghai Madoi M(s)7. 4 earthquake sequence: Insight from aftershock relocations and focal mechanism solutions.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,65(2),552-562. |
| MLA | Zhang JianYong,et al."Seismotectonics and fault geometries of the Qinghai Madoi M(s)7. 4 earthquake sequence: Insight from aftershock relocations and focal mechanism solutions".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 65.2(2022):552-562. |
入库方式： OAI收割
来源：地质与地球物理研究所
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