Resolving Horizontal Rupture Directivity of Moderate Crustal Earthquake in Sparse Network With Ambient Noise Location

doi:10.1002/2017JB014735

CORC > 武汉植物园 > 中国科学院武汉植物园

	Resolving Horizontal Rupture Directivity of Moderate Crustal Earthquake in Sparse Network With Ambient Noise Location
	He, X.1,2; Ni, S.3
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2018
卷号	123 期号:1 页码:533-552
关键词	rupture directivity ambient noise centroid location sparse network
ISSN号	2169-9313
DOI	10.1002/2017JB014735
英文摘要	Earthquake rupture directivity can remove fault plane ambiguity in earthquake moment tensor solutions; thus, it is helpful to improve reliability of shake map and understanding the seismogenic processes. In this paper, we propose an algorithm to resolve the horizontal rupture directivity of moderate crustal earthquakes in two steps. The first step is to determine the two candidate fault planes from focal mechanism inversion. Then, rupture directivity is estimated via the difference between the hypocenter and the centroid location which is constrained on the candidate fault planes. Accurate centroid location is determined with ambient noise location method, in which the noise cross-correlation functions (NCFs) provide a stable calibration for the path effects. This technique is applied to the 2011 Oklahoma earthquake, and the estimated centroid location is about 2-4km southwest to the hypocenter, indicating that the mainshock ruptured along the 234 degrees plane for about 4-8km. The result is consistent with directivity estimation using a foreshock as reference event and also agrees with early aftershock distribution as well as finite fault inversion. More applications to the 2004 Parkfield earthquake and the 2014 Napa earthquake are performed to explore the effectiveness and limitation of this method. This method is helpful for determining rupture directivity of earthquakes in sparse network but requiring one or two nearby stations. Alternatively, temporary stations can be installed in the area of high seismic hazard, then a library of NCFs and path calibrations would be available for rapidly determining rupture directivity of future earthquakes.
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDB18010201] ; NSFC[41461164003] ; NSFC[41274069] ; Guangdong Province Introduced Innovative R&D Team of Geological Processes and Natural Disasters around the South China Sea[2016ZT06N331]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000426132600031
内容类型	期刊论文
源URL	[http://202.127.146.157/handle/2RYDP1HH/4663]
专题	中国科学院武汉植物园
通讯作者	He, X.
作者单位	1.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangdong Prov Key Lab Geodynam & Geohazards, Guangzhou, Guangdong, Peoples R China 2.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei, Anhui, Peoples R China 3.Chinese Acad Sci, Inst Geodesy & Geophys, State Key Lab Geodesy & Earths Dynam, Wuhan, Hubei, Peoples R China
推荐引用方式 GB/T 7714	He, X.,Ni, S.. Resolving Horizontal Rupture Directivity of Moderate Crustal Earthquake in Sparse Network With Ambient Noise Location[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2018,123(1):533-552.
APA	He, X.,&Ni, S..(2018).Resolving Horizontal Rupture Directivity of Moderate Crustal Earthquake in Sparse Network With Ambient Noise Location.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,123(1),533-552.
MLA	He, X.,et al."Resolving Horizontal Rupture Directivity of Moderate Crustal Earthquake in Sparse Network With Ambient Noise Location".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 123.1(2018):533-552.