Insights Into the Kinematic Rupture of the 2015 M-w 8.3 Illapel, Chile, Earthquake From Joint Analysis of Geodetic, Seismological, Tsunami, and Superconductive Gravimeter Observations

doi:10.1029/2018JB016065

CORC > 武汉植物园 > 中国科学院武汉植物园

	Insights Into the Kinematic Rupture of the 2015 M-w 8.3 Illapel, Chile, Earthquake From Joint Analysis of Geodetic, Seismological, Tsunami, and Superconductive Gravimeter Observations
	Chen, Xiaodong 1; Xiong, Xiong 3; Shan, Bin 3; An, Chao 2; Liu, Chengli 3
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2018-11-01
卷号	123 期号:11 页码:9778-9799
关键词	Illapel earthquake kinematic rupture process tsunami simulation joint inversion seismic gap interseismic coupling
ISSN号	2169-9313
DOI	10.1029/2018JB016065
英文摘要	We investigated the spatiotemporal slip distribution of the 2015 Illapel earthquake (M-w=8.3) by joint analyses of geodetic, seismological, tsunami, and superconductive gravimeter observations. The coseismic rupture directly overlaps the interseismic coupling zone determined by onshore geodetic measurements. The main slip asperity is located north of the hypocenter with a peak slip of 9.2m, and the rupture spans 200km along strike and 150km along dip with an average rupture speed of 2.0km/s. Most aftershocks reveal a clear complementary distribution with the coseismic rupture; that is, aftershock clusters are located at the border of unbroken barriers and regions of sudden transition from high to low rupture area. The calculated Coulomb failure stress changes indicate that 80% of the aftershocks were triggered by the main event. The low-frequency radiation corresponds to the large coseismic rupture at the shallow portion of the megathrust, while the high-frequency radiation is associated with the edge of large slip asperity or an isolated patch at a deeper position. The large coseismic slip region correlates well with the high Vp/Vs ratio of the subduction interface, which implies that the Illapel earthquake might nucleate at a relatively weak patch within a strong coupled zone. Furthermore, we argue that the coseismic slip did reach to the trench from tsunami simulations, and historical earthquakes analyses indicate a complex strain accumulation and release in central Chile.
资助项目	National Natural Science Foundation of China[41731072] ; National Natural Science Foundation of China[41604057] ; National Natural Science Foundation of China[41574072] ; Fundamental Research Funds for the Central University, China University of Geosciences (Wuhan)[106-162301132636] ; Shanghai Pujiang Program
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000454775200041
内容类型	期刊论文
源URL	[http://202.127.146.157/handle/2RYDP1HH/6264]
专题	中国科学院武汉植物园
通讯作者	Liu, Chengli
作者单位	1.Chinese Acad Sci, Inst Geodesy & Geophys, State Key Lab Geodesy & Earths Dynam, Wuhan, Hubei, Peoples R China 2.Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, Shanghai, Peoples R China 3.China Univ Geosci, Inst Geophys & Geomat, Hubei Subsurface Multiscale Imaging Key Lab, Wuhan, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Chen, Xiaodong,Xiong, Xiong,Shan, Bin,et al. Insights Into the Kinematic Rupture of the 2015 M-w 8.3 Illapel, Chile, Earthquake From Joint Analysis of Geodetic, Seismological, Tsunami, and Superconductive Gravimeter Observations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2018,123(11):9778-9799.
APA	Chen, Xiaodong,Xiong, Xiong,Shan, Bin,An, Chao,&Liu, Chengli.(2018).Insights Into the Kinematic Rupture of the 2015 M-w 8.3 Illapel, Chile, Earthquake From Joint Analysis of Geodetic, Seismological, Tsunami, and Superconductive Gravimeter Observations.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,123(11),9778-9799.
MLA	Chen, Xiaodong,et al."Insights Into the Kinematic Rupture of the 2015 M-w 8.3 Illapel, Chile, Earthquake From Joint Analysis of Geodetic, Seismological, Tsunami, and Superconductive Gravimeter Observations".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 123.11(2018):9778-9799.