DOI: 10.1002/2015GL067529
论文题名: Earthquakes initiation and thermal shear instability in the Hindu Kush intermediate depth nest
作者: Poli P. ; Prieto G. ; Rivera E. ; Ruiz S.
刊名: Geophysical Research Letters
ISSN: 0094-9348
EISSN: 1944-9079
出版年: 2016
卷: 43, 期: 4 起始页码: 1537
结束页码: 1542
语种: 英语
英文关键词: deep earthquakes
; earthquake energy release
; earthquakes nest
; seismology
; subduction zones
; thermal shear instability
Scopus关键词: Geophysics
; Seismology
; Deep earthquakes
; Energy release
; Intermediate depths
; Intermediate-depth earthquakes
; Physical mechanism
; Seismically active region
; Shear instability
; Subduction zones
; Earthquakes
英文摘要: Intermediate depth earthquakes often occur along subducting lithosphere, but despite their ubiquity the physical mechanism responsible for promoting brittle or brittle-like failure is not well constrained. Large concentrations of intermediate depth earthquakes have been found to be related to slab break-off, slab drip, and slab tears. The intermediate depth Hindu Kush nest is one of the most seismically active regions in the world and shows the correlation of a weak region associated with ongoing slab detachment process. Here we study relocated seismicity in the nest to constraint the geometry of the shear zone at the top of the detached slab. The analysis of the rupture process of the Mw 7.5 Afghanistan 2015 earthquake and other several well-recorded events over the past 25 years shows an initially slow, highly dissipative rupture, followed by a dramatic dynamic frictional stress reduction and corresponding large energy radiation. These properties are typical of thermal driven rupture processes. We infer that thermal shear instabilities are a leading mechanism for the generation of intermediated-depth earthquakes especially in presence of weak zone subjected to large strain accumulation, due to ongoing detachment process. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84959191633&doi=10.1002%2f2015GL067529&partnerID=40&md5=ba6176c6470548d5e691b14287f07618
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10311
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Poli P.,Prieto G.,Rivera E.,et al. Earthquakes initiation and thermal shear instability in the Hindu Kush intermediate depth nest[J]. Geophysical Research Letters,2016-01-01,43(4).