气候变化领域集成服务门户(CCPortal): Space Imaging Geodesy Reveals Near Circular; Coseismic Block Rotation During the 2016 Mw 7.8 Kaikōura Earthquake; New Zealand

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DOI	10.1029/2020GL090206
	Space Imaging Geodesy Reveals Near Circular; Coseismic Block Rotation During the 2016 Mw 7.8 Kaikōura Earthquake; New Zealand
	Wang T.; Jiao L.; Tapponnier P.; Shi X.; Wei S.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	Large earthquakes usually rupture plate boundary faults, releasing the accumulated stress as displacements localized along smooth, narrow faults. However, certain earthquakes initiate off main faults, rupturing adjacent, secondary faults. The mechanisms of such atypical stress release remain enigmatic, partly due to a lack of detailed geodetic evidence. Here using the 3D coseismic displacement field derived from space imaging geodesy, we detect 10-km-scale, nearly-circular coseismic block rotation during the 2016 Mw 7.8 Kaikōura earthquake in New Zealand. Together, geodetic observations, longer term local paleomagnetic data, analytical, and discrete element modeling imply that localized block rotation occurred south of the Hope fault along weak, steep, bedding-parallel boundaries within a narrow, ~20-km-wide dextral shear zone. That stress near plate boundary faults can be partially released in zones of distributed ruptures absorbing coseismic rotation may retard rupture along main faults. Our observations also suggest that coseismic rotation may help accomodate plate boundary propagation. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Earthquakes; Geodesy; Rotation; Accumulated stress; Co-seismic displacement; Discrete element modeling; Geodetic observation; Large earthquakes; Paleomagnetic data; Plate boundaries; Stress release; Faulting; block rotation; earthquake event; earthquake rupture; imaging method; observational method; plate boundary; New Zealand
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169423
作者单位	School of Earth and Space Sciences, Peking University, Beijing, China; Institut de Physique du Globe de Paris, CNRS, Université de Paris, Paris, France; Key Laboratory of Crustal Dynamics, National Institute of Natural Hazards, MEMC, Beijing, China; School of Earth Sciences, Zhejiang University, Hangzhou, China; Research Center for Structures in Oil- and Gas-Bearing Basins, Ministry of Education, Hangzhou, China; Earth Observatory of Singapore/Asian School of the Environment, Nanyang Technological University, Singapore, Singapore
推荐引用方式 GB/T 7714	Wang T.,Jiao L.,Tapponnier P.,et al. Space Imaging Geodesy Reveals Near Circular; Coseismic Block Rotation During the 2016 Mw 7.8 Kaikōura Earthquake; New Zealand[J],2020,47(22).
APA	Wang T.,Jiao L.,Tapponnier P.,Shi X.,&Wei S..(2020).Space Imaging Geodesy Reveals Near Circular; Coseismic Block Rotation During the 2016 Mw 7.8 Kaikōura Earthquake; New Zealand.Geophysical Research Letters,47(22).
MLA	Wang T.,et al."Space Imaging Geodesy Reveals Near Circular; Coseismic Block Rotation During the 2016 Mw 7.8 Kaikōura Earthquake; New Zealand".Geophysical Research Letters 47.22(2020).