Institutional Repository of Key Laboratory of Earth and Planetary Physics, Chinese Academy of Sciences
| Effects of the accretionary wedge and sedimentary layers on subduction zone earthquake ruptures and ground motion: 2-D numerical simulations | |
| Li, Xian1,2; Huang, Yihe3; Chen, Zuan1,2,4; Huang, Xiaoge1,2 | |
| 2022-11-22 | |
| Source Publication | GEOPHYSICAL JOURNAL INTERNATIONAL
 |
| ISSN | 0956-540X |
| Volume | 232Issue:3Pages:2049-2069 |
| Abstract | Low-velocity accretionary wedges and sedimentary layers overlying continental plates are common in subduction zones. These low-velocity sedimentary structures should be considered to accurately model ground motions and estimate coseismic slip on subsurface faults. First, we simulated the rupture process of the 2011 M-w 9.0 Tohoku-Oki earthquake in 2-D dynamic rupture models and found that the co-existence of the accretionary wedge and sedimentary layer can cause an approximately 60 per cent increase in the shallow coseismic slip. Considering the inelastic attenuation, wave reverberations in the accretionary wedge and sedimentary layer significantly amplified offshore ground acceleration at 0.1-0.5 Hz by factors of 1-5 and prolonged ground motion durations. Additionally, high-frequency acceleration at 0.5-2.0 Hz is also amplified on the accretionary wedge with a maximum factor of 5. Our Tohoku-Oki earthquake model reproduces the observed coseismic slip qualitatively, but the model also results in higher scaled energy, due to the overestimation of radiated energy in 2-D models and the inadequate plastic properties in the accretionary wedge and sedimentary layer. We further simulated a suite of earthquake scenarios where the updip rupture terminates at different depths. Our results show that a sedimentary layer enhances coseismic slip in all cases, while an accretionary wedge can decrease the slip when the shallow fault has a strengthening frictional behaviour. Additionally, the effects on slip diminished when the extent of updip rupture becomes deeper. However, offshore ground acceleration at 0.1-0.5 Hz is still amplified due to the dynamic wave effects in the two structures. Furthermore, in the scenarios when earthquake rupture reaches the shallow fault, the existence of an accretionary wedge can cause amplified high-frequency acceleration (0.5-2.0 Hz) near the trench. Our results indicate that compared to those subduction zones with neither an accretionary wedge nor sedimentary layers, subduction zones featuring a co-existence between an accretionary wedge and sedimentary layers are susceptible to host earthquakes with larger shallow slip and amplified offshore ground motions. |
| Keyword | Japan Computational seismology Earthquake dynamics Earthquake ground motions |
| DOI | 10.1093/gji/ggac429 |
| Funding Organization | China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| WOS Keyword | CRUSTAL STRUCTURE ; DYNAMIC RUPTURE ; WIDE-ANGLE ; MEGATHRUST BENEATH ; CONTINENTAL-MARGIN ; TRENCH ; SLIP ; FRICTION ; STRESS ; JAPAN |
| Language | 英语 |
| Funding Project | China Scholarship Council ; National Natural Science Foundation of China ; [201904910712] ; [41774096] |
| Funding Organization | China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| WOS Research Area | Geochemistry & Geophysics |
| WOS Subject | Geochemistry & Geophysics |
| WOS ID | WOS:000897167500005 |
| Publisher | OXFORD UNIV PRESS |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.iggcas.ac.cn/handle/132A11/106784 |
| Collection | 地球与行星物理院重点实验室 页岩气与地质工程院重点实验室 |
| Corresponding Author | Li, Xian |
| Affiliation | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 3.Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China |
| First Author Affilication | Institute of Geology and Geophysics, Chinese Academy of Sciences |
| Corresponding Author Affilication | Institute of Geology and Geophysics, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Li, Xian,Huang, Yihe,Chen, Zuan,et al. Effects of the accretionary wedge and sedimentary layers on subduction zone earthquake ruptures and ground motion: 2-D numerical simulations[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2022,232(3):2049-2069. |
| APA | Li, Xian,Huang, Yihe,Chen, Zuan,&Huang, Xiaoge.(2022).Effects of the accretionary wedge and sedimentary layers on subduction zone earthquake ruptures and ground motion: 2-D numerical simulations.GEOPHYSICAL JOURNAL INTERNATIONAL,232(3),2049-2069. |
| MLA | Li, Xian,et al."Effects of the accretionary wedge and sedimentary layers on subduction zone earthquake ruptures and ground motion: 2-D numerical simulations".GEOPHYSICAL JOURNAL INTERNATIONAL 232.3(2022):2049-2069. |
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