气候变化领域集成服务门户(CCPortal): Anomalously low aftershock productivity of the 2019 MW 8.0 energetic intermediate-depth faulting beneath Peru

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DOI	10.1016/j.epsl.2020.116528
	Anomalously low aftershock productivity of the 2019 MW 8.0 energetic intermediate-depth faulting beneath Peru
	Ye L.; Lay T.; Kanamori H.
发表日期	2020
ISSN	0012821X
卷号	549
英文摘要	The 26 May 2019 Peru (MW 8.0) earthquake struck within the nearly-horizontal underthrust Nazca plate at depths from ∼110 to 150 km below the upper Amazon, near a steep bend in the plate where it plunges down to a deep earthquake zone. Little prior seismicity occurred in this region, but large intraslab events with similar normal-faulting mechanisms have occurred to the west. The event is situated in a similar slab position to the 2017 Puebla-Morelos, Mexico earthquake, but the remote location resulted in limited loss of life and damage. Back-projection imaging and finite-fault inversion based on teleseismic data suggest a brittle and energetic rupture process with unilateral expansion northward over a 170-km-long zone at a rupture speed, Vr ∼3 km/s, with three normal-faulting patches of up to ∼4.5 m slip. Despite the mainshock size, it produced only three M4.0+ aftershocks within 300 km (one nearby); the aftershock productivity of the 2019 Peru earthquake is very low even among all large intermediate-depth earthquakes, but similar to that for other large Peruvian intraslab events. Comparison of aftershock productivity of the Peru event with that of global large earthquakes in various tectonic settings suggests that the low aftershock productivity can largely be attributed to regionally homogeneous faulting systems and relatively uniform stress state in the flat Peru slab. © 2020
关键词	2019 Peru earthquake aftershock productivity flat slab intermediate-depth earthquakes stress heterogeneity
英文关键词	Fault slips; Productivity; Back-projection imaging; Deep earthquakes; Finite fault inversions; Intermediate depths; Intermediate-depth earthquakes; Large earthquakes; Mexico earthquake; Tectonic settings; Earthquakes; aftershock; earthquake event; earthquake magnitude; heterogeneity; normal fault; seismic velocity; seismicity; tectonic setting; Peru
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202989
作者单位	Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou, China; Department of Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA 95064, United States; Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125, United States
推荐引用方式 GB/T 7714	Ye L.,Lay T.,Kanamori H.. Anomalously low aftershock productivity of the 2019 MW 8.0 energetic intermediate-depth faulting beneath Peru[J],2020,549.
APA	Ye L.,Lay T.,&Kanamori H..(2020).Anomalously low aftershock productivity of the 2019 MW 8.0 energetic intermediate-depth faulting beneath Peru.Earth and Planetary Science Letters,549.
MLA	Ye L.,et al."Anomalously low aftershock productivity of the 2019 MW 8.0 energetic intermediate-depth faulting beneath Peru".Earth and Planetary Science Letters 549(2020).