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DOI | 10.1029/2020GL087508 |
Rupture Dynamics of the 2012 Nicoya M-w 7.6 Earthquake: Evidence for Low Strength on the Megathrust | |
Yao, Suli; Yang, Hongfeng | |
2020-06-09 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:13 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Frictional properties on subduction interfaces are essential for understanding earthquake nucleation, rupture propagation, and tsunami generation during megathrust earthquakes. Because they cannot be directly observed, they have been inferred from different approaches. However, none of them have reported constraints immediately before a megathrust earthquake. Here we quantify the frictional strength on the megathrust prior to the 2012 M-w 7.6 Nicoya earthquake by conducting spontaneous rupture simulations with constraints from near-field observations. Our preferred dynamic rupture model shows a remarkable fit on the near-field data. The simulation results indicate an average strength drop of f(d) <= 0.2 and the static friction coefficient f(s) = 0.6, we infer that the average strength on the megathrust is <= 7.5 MPa. Such low strength is attributed to the near-lithostatic pore pressure along the subduction interface, which is implied by seismic studies in this region. Plain Language Summary Subduction zones host a preponderance of great earthquakes that are sometimes accompanied by destructive tsunamis. The frictional resistance (strength) on subduction interfaces, termed megathrusts, plays critical roles in controlling earthquake rupture process and thus significantly impacts the ground motion intensity and the tsunamigenic potential during earthquakes. However, the strength on the megathrust is difficult to estimate directly and evolves over time. Here, we constrain the strength on the Nicoya megathrust shortly before the 2012 Nicoya M-w 7.6 earthquake with constraints from near-field observations. Based on the simulation results, we infer the strength on the megathrust prior to the earthquake to be less than 7.5 MPa. Such low strength at similar to 25 km in depth indicates the existence of compacted fluids with a high pore pressure. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000551465400054 |
WOS关键词 | FAULT LUBRICATION ; PLATE BOUNDARY ; STRONG-MOTION ; HEAT-FLOW ; FRICTION ; SLIP ; STRESS ; PROPAGATION ; CHINA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/274378 |
专题 | 气候变化 |
作者单位 | Chinese Univ Hong Kong, Shatin, Earth Syst Sci Programme, Hong Kong, Peoples R China |
推荐引用方式 GB/T 7714 | Yao, Suli,Yang, Hongfeng. Rupture Dynamics of the 2012 Nicoya M-w 7.6 Earthquake: Evidence for Low Strength on the Megathrust[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(13). |
APA | Yao, Suli,&Yang, Hongfeng.(2020).Rupture Dynamics of the 2012 Nicoya M-w 7.6 Earthquake: Evidence for Low Strength on the Megathrust.GEOPHYSICAL RESEARCH LETTERS,47(13). |
MLA | Yao, Suli,et al."Rupture Dynamics of the 2012 Nicoya M-w 7.6 Earthquake: Evidence for Low Strength on the Megathrust".GEOPHYSICAL RESEARCH LETTERS 47.13(2020). |
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