气候变化领域集成服务门户(CCPortal): Role of Serpentinized Mantle Wedge in Affecting Megathrust Seismogenic Behavior in the Area of the 2010 M = 8.8 Maule Earthquake

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DOI	10.1029/2020GL090482
	Role of Serpentinized Mantle Wedge in Affecting Megathrust Seismogenic Behavior in the Area of the 2010 M = 8.8 Maule Earthquake
	Wang K.; Huang T.; Tilmann F.; Peacock S.M.; Lange D.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	What controls subduction megathrust seismogenesis downdip of the mantle wedge corner (MWC)? We propose that, in the region of the 2010 Mw = 8.8 Maule, Chile, earthquake, serpentine minerals derived from the base of the hydrated mantle wedge exert a dominant control. Based on modeling, we predict that the megathrust fault zone near the MWC contains abundant lizardite/chrysotile-rich serpentinite that transforms to antigorite-rich serpentinite at greater depths. From the MWC at 32–40 km depth to at least 55 km, the predominantly velocity-strengthening megathrust accommodated dynamic propagation of the 2010 rupture but with small slip and negative stress drop. The downdip distribution of interplate aftershocks exhibits a gap around the MWC that can be explained by the velocity-strengthening behavior of lizardite/chrysotile. Interspersed velocity-weakening and dynamic weakening antigorite-rich patches farther downdip may be responsible for increased abundance of aftershocks and possibly for some of the high-frequency energy radiation during the 2010 rupture. © 2020. Her Majesty the Queen in Right of Canada. Reproduced with the permission of the Minister of Natural Resources Canada.
英文关键词	Crack propagation; Kaolinite; Magnesite; Serpentine; Dynamic propagation; High frequency HF; Hydrated mantle wedges; Negative stress; Seismogenesis; Serpentine minerals; Serpentinite; Velocity-weakening; Earthquakes; earthquake magnitude; earthquake rupture; fault zone; mantle; seismogram; serpentinization; subduction; subduction zone; tectonic wedge; thrust; Chile
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/169425
作者单位	Pacific Geoscience Centre, Geological Survey of Canada, Sidney, BC, Canada; School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada; Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ), Potsdam, Germany; Institute for Geological Sciences, Freie Universität Berlin, Berlin, Germany; Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada; GEOMAR, Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
推荐引用方式 GB/T 7714	Wang K.,Huang T.,Tilmann F.,et al. Role of Serpentinized Mantle Wedge in Affecting Megathrust Seismogenic Behavior in the Area of the 2010 M = 8.8 Maule Earthquake[J],2020,47(22).
APA	Wang K.,Huang T.,Tilmann F.,Peacock S.M.,&Lange D..(2020).Role of Serpentinized Mantle Wedge in Affecting Megathrust Seismogenic Behavior in the Area of the 2010 M = 8.8 Maule Earthquake.Geophysical Research Letters,47(22).
MLA	Wang K.,et al."Role of Serpentinized Mantle Wedge in Affecting Megathrust Seismogenic Behavior in the Area of the 2010 M = 8.8 Maule Earthquake".Geophysical Research Letters 47.22(2020).