Characterizing the Final Stage of Simulated Earthquake Nucleation Governed by Rate-And-State Fault Friction
文献类型：期刊论文
| 作者 | He, Changrong2; Zhang, Lei2; Liu, Peixun2; Chen, Qi-Fu1 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2023-05-01 |
| 卷号 | 128期号:5页码:21 |
| ISSN号 | 2169-9313 |
| 关键词 | earthquake nucleation rate-and-state friction elastic medium numerical simulation weakening-zone core |
| DOI | 10.1029/2023JB026422 |
| 英文摘要 | Previous experiments and modeling on earthquake nucleation reveal accelerating slip and development of a final patch of fixed or expanding length, but whether the nucleation phase is spatially large enough to be detected in real-Earth conditions with durations long enough to be helpful is unknown. This study performed a suit of simulations of the nucleation process based on the rate-and-state friction law on homogeneous faults started from a "locked" state. Our results reveal the development of a weakening-zone core (WZcore, defined as a region bounded by two outwardly moving shoulders of stress distribution during the early phase, and later bounded by two inwardly shifting edges between the stress-releasing region and stress-increasing exterior) where stress releases continuously, which expands first to a dimension less than the half fault length then shrinks to a final length before re-expanding. The slip rate within the WZcore is above several times of the driving rate, and the high-rate region expands constantly up to the instability. The WZcore is similar to a strain-releasing zone in our new experiment. Under the assumption that much higher seismicity rate can be observed within the WZcore due to higher slip rate and stress-releasing state as augmented driving force for small asperities, these nucleation features, as well as the slip rate levels in our model, are consistent with step-like increases in seismicity preceding large subduction earthquakes. On the time scale, duration of the WZcore is weeks before large subduction earthquakes under high driving rate, but years on low-rate continental faults. |
| WOS关键词 | 2014 IQUIQUE ; SLIP INSTABILITY ; EVOLUTION ; RUPTURE ; DISPLACEMENT ; PROPAGATION ; FORESHOCKS ; STABILITY ; BOUNDARY ; SEQUENCE |
| 资助项目 | National Key R&D Program of China[2018YFC1503301] ; State Key Laboratory of Earthquake Dynamics, Institute of Geology, CEA[LED2021A08] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:001000303800033 |
| 资助机构 | National Key R&D Program of China ; State Key Laboratory of Earthquake Dynamics, Institute of Geology, CEA ; National Key R&D Program of China ; State Key Laboratory of Earthquake Dynamics, Institute of Geology, CEA ; National Key R&D Program of China ; State Key Laboratory of Earthquake Dynamics, Institute of Geology, CEA ; National Key R&D Program of China ; State Key Laboratory of Earthquake Dynamics, Institute of Geology, CEA |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/111001]  |
| 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 | He, Changrong |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China 2.China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, Changrong,Zhang, Lei,Liu, Peixun,et al. Characterizing the Final Stage of Simulated Earthquake Nucleation Governed by Rate-And-State Fault Friction[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2023,128(5):21. |
| APA | He, Changrong,Zhang, Lei,Liu, Peixun,&Chen, Qi-Fu.(2023).Characterizing the Final Stage of Simulated Earthquake Nucleation Governed by Rate-And-State Fault Friction.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,128(5),21. |
| MLA | He, Changrong,et al."Characterizing the Final Stage of Simulated Earthquake Nucleation Governed by Rate-And-State Fault Friction".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 128.5(2023):21. |
入库方式： OAI收割
来源：地质与地球物理研究所
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