DOI: 10.1016/j.epsl.2020.116528
论文题名: Anomalously low aftershock productivity of the 2019 MW 8.0 energetic intermediate-depth faulting beneath Peru
作者: Ye L. ; Lay T. ; Kanamori H.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 549 语种: 英语
中文关键词: 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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165367
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Ye L.,Lay T.,Kanamori H.. Anomalously low aftershock productivity of the 2019 MW 8.0 energetic intermediate-depth faulting beneath Peru[J]. Earth and Planetary Science Letters,2020-01-01,549