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Effects of the accretionary wedge and sedimentary layers on subduction zone earthquake ruptures and ground motion: 2-D numerical simulations

文献类型：期刊论文

作者Li, Xian1,3; Huang, Yihe2; Chen, Zuan1,3,4; Huang, Xiaoge1,3
刊名GEOPHYSICAL JOURNAL INTERNATIONAL
出版日期2022-11-22
卷号232期号:3页码:2049-2069
关键词Japan Computational seismology Earthquake dynamics Earthquake ground motions
ISSN号0956-540X
DOI10.1093/gji/ggac429
英文摘要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.
WOS关键词CRUSTAL STRUCTURE ; DYNAMIC RUPTURE ; WIDE-ANGLE ; MEGATHRUST BENEATH ; CONTINENTAL-MARGIN ; TRENCH ; SLIP ; FRICTION ; STRESS ; JAPAN
资助项目China Scholarship Council ; National Natural Science Foundation of China ; [201904910712] ; [41774096]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000897167500005
出版者OXFORD UNIV PRESS
资助机构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
源URL[http://ir.iggcas.ac.cn/handle/132A11/106784]  
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
地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者Li, Xian
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
2.Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
推荐引用方式
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.

入库方式： OAI收割

来源：地质与地球物理研究所

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