气候变化领域集成服务门户(CCPortal): Back-propagating supershear rupture in the 2016 M w 7.1 Romanche transform fault earthquake

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DOI	10.1038/s41561-020-0619-9
	Back-propagating supershear rupture in the 2016 M w 7.1 Romanche transform fault earthquake
	Hicks S.P.; Okuwaki R.; Steinberg A.; Rychert C.A.; Harmon N.; Abercrombie R.E.; Bogiatzis P.; Schlaphorst D.; Zahradnik J.; Kendall J.-M.; Yagi Y.; Shimizu K.; Sudhaus H.
发表日期	2020
ISSN	17520894
起始页码	647
结束页码	653
卷号	13 期号:9
英文摘要	How an earthquake rupture propagates strongly influences the potentially destructive ground shaking. Complex ruptures often involve slip along multiple faults, which masks information on the frictional behaviour of fault zones. Geometrically smooth ocean transform fault plate boundaries offer a favourable environment to study fault dynamics, because strain is accommodated along a single, wide fault zone that offsets the homogeneous geology. Here we present an analysis of the 2016 Mw 7.1 earthquake on the Romanche fracture zone in the equatorial Atlantic, using data from both nearby seafloor seismometers and global seismic networks. We show that this rupture had two phases: (1) upward and eastward propagation towards a weaker region where the transform fault intersects the mid-ocean ridge, and then (2) an unusual back-propagation westwards at a supershear speed towards the centre of the fault. We suggest that deep rupture into weak fault segments facilitated greater seismic slip on shallow locked zones. This highlights that even earthquakes along a single distinct fault zone can be highly dynamic. Observations of back-propagating ruptures are sparse, and the possibility of reverse propagation is largely absent in rupture simulations and unaccounted for in hazard assessments. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	back propagation; earthquake rupture; fault geometry; geometry; mid-ocean ridge; seafloor spreading; seismic attenuation; shallow water; Atlantic Ocean; Atlantic Ocean; Romanche Fracture Zone
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206787
作者单位	Department of Earth Science and Engineering, Imperial College London, London, United Kingdom; Department of Ocean and Earth Science, University of Southampton, Southampton, United Kingdom; Mountain Science Center, Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan; COMET, School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Department of Geosciences, Christian-Albrechts-Universität, Kiel, Germany; BGR, Federal Institute for Geosciences and Natural Resources, Hanover, Germany; Department of Earth and Environment, Boston University, Boston, MA, United States; Department of Earth Science, University of Bristol, Bristol, United Kingdom; Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal; Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic; Department of Earth Sciences, University of Oxford, Oxford, United Kingdom
推荐引用方式 GB/T 7714	Hicks S.P.,Okuwaki R.,Steinberg A.,et al. Back-propagating supershear rupture in the 2016 M w 7.1 Romanche transform fault earthquake[J],2020,13(9).
APA	Hicks S.P..,Okuwaki R..,Steinberg A..,Rychert C.A..,Harmon N..,...&Sudhaus H..(2020).Back-propagating supershear rupture in the 2016 M w 7.1 Romanche transform fault earthquake.Nature Geoscience,13(9).
MLA	Hicks S.P.,et al."Back-propagating supershear rupture in the 2016 M w 7.1 Romanche transform fault earthquake".Nature Geoscience 13.9(2020).