Co-seismic deformation following the 2007 Bengkulu earthquake constrained by GRACE and GPS observations

doi:10.1016/j.pepi.2018.04.009

NTSC-IR

	Co-seismic deformation following the 2007 Bengkulu earthquake constrained by GRACE and GPS observations
	Zheng, Zengji 1,3,4; Jin, Shuanggen 1,2; Fan, Lihong 5
	2018-07-01
发表期刊	PHYSICS OF THE EARTH AND PLANETARY INTERIORS
ISSN	0031-9201
卷号	280 页码:20-31
摘要	Gravity changes caused by giant earthquakes can be detected by Gravity Recovery and Climate Experiment (GRACE), which provide new constraints on earthquake ruptures. However, detailed rupture, seismic moment and density/displacement-induced gravity changes are not clear for less than Mw = 8.5 earthquakes. In this paper, the fault parameters of the 2007 Mw = 8.4 Bengkulu earthquake are retrieved from GRACE and GPS data, and the fault slip distribution is inverted using GPS data. Furthermore, the theoretical coseismic displacements and coseismic gravity changes from different slip models are compared with GPS and GRACE data. The results show that the significant positive and negative gravity anomalies with a peak magnitude of -2.0 to 1.3 gal are extracted from GRACE data. The GRACE-inverted and joint-inverted seismic moment of the Bengkulu earthquake are 3.27 x 10(21) Nm and 3.30 x 10(21) Nm with the rake angle of 108 degrees and 114 degrees, respectively. The GPS-inverted Mw = 8.4 earthquake is mainly dominated by the thrusting with slight right-lateral strike-slip, which is consistent with the focal mechanism. GRACE-observed coseismic gravity changes agree well with the results from the fault models based on the spherically dislocation theories in spatial pattern, but are larger than model estimated results in magnitude. The coseismic gravity changes caused by the density change are basically same as those caused by the vertical displacement in the magnitude of order, which are -0.8 to 0.2 mu gal and -0.2 to 1.4 mu gal for the Caltech model, -0.9 to 0.2 mu gal and -0.5 to 1.3 mu gal for the USGS model, and -0.9 to 0.2 mu gal and -0.3 to 1.3 mu gal for the GPS-inverted layered model. In addition, both the near-field and the far-field displacements calculated from the Caltech model and GPS-inverted layered model are in good agreement with the GPS observations, whereas the USGS model has good agreement in the far-field and poor agreement in the near-field with the GPS observations, especially in the Pagai Selatan area.
关键词	Seismic deformation Fault slip GRACE GPS
资助者	National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC)
DOI	10.1016/j.pepi.2018.04.009
关键词[WOS]	2011 TOHOKU EARTHQUAKE ; SUMATRA-ANDAMAN EARTHQUAKE ; SATELLITE GRAVITY ; SOURCE PARAMETERS ; OKI EARTHQUAKE ; INVERSION ; MODEL ; AFTERSLIP ; GRAVIMETRY ; CHILE
语种	英语
资助项目	National Natural Science Foundation of China (NSFC)[11373059]
资助者	National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC)
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000435054100002
出版者	ELSEVIER SCIENCE BV
引用统计
文献类型	期刊论文
条目标识符	http://210.72.145.45/handle/361003/11604
专题	中国科学院国家授时中心
通讯作者	Jin, Shuanggen
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Nanjing Univ Informat Sci & Technol, Sch Remote Sensing & Geomat Engn, Nanjing 210044, Jiangsu, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Shaanxi Earthquake Agcy, Xian 710068, Shaanxi, Peoples R China 5.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Zengji,Jin, Shuanggen,Fan, Lihong. Co-seismic deformation following the 2007 Bengkulu earthquake constrained by GRACE and GPS observations[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2018,280:20-31.
APA	Zheng, Zengji,Jin, Shuanggen,&Fan, Lihong.(2018).Co-seismic deformation following the 2007 Bengkulu earthquake constrained by GRACE and GPS observations.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,280,20-31.
MLA	Zheng, Zengji,et al."Co-seismic deformation following the 2007 Bengkulu earthquake constrained by GRACE and GPS observations".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 280(2018):20-31.