DOI: 10.1002/2013GL058096
论文题名: Breaking the oceanic lithosphere of a subducting slab: The 2013 Khash, Iran earthquake
作者: Barnhart W.D. ; Hayes G.P. ; Samsonov S.V. ; Fielding E.J. ; Seidman L.E.
刊名: Geophysical Research Letters
ISSN: 0094-10506
EISSN: 1944-10237
出版年: 2014
卷: 41, 期: 1 起始页码: 32
结束页码: 36
语种: 英语
英文关键词: InSAR
; intermediate-depth earthquakes
; intraplate earthquakes
; mantle earthquake
; slip distributions
; subduction zones
Scopus关键词: InSAR
; Intermediate-depth earthquakes
; Intraplate earthquakes
; Slip distribution
; Subduction zones
; Dehydration
; Earthquakes
; Structural geology
; Synthetic aperture radar
; Fault slips
; crust
; dehydration
; earthquake event
; geodesy
; geophysical survey
; interferometry
; mantle
; oceanic lithosphere
; seismology
; subduction
; synthetic aperture radar
; teleseismic wave
; Iran
; Khash
; Sistan va Baluchestan
英文摘要: Large intermediate-depth, intraslab normal-faulting earthquakes are a common, dangerous, but poorly understood phenomenon in subduction zones owing to a paucity of near-field geophysical observations. Seismological and high-quality geodetic observations of the 2013 Mw7.7 Khash, Iran earthquake reveal that at least half of the oceanic lithosphere, including the mantle and entire crust, ruptured in a single earthquake, confirming with unprecedented resolution that large earthquakes can nucleate in and rupture through the oceanic mantle. A rupture width of at least 55 km is required to explain both Interferometric Synthetic Aperture Radar observations and teleseismic waveforms, with the majority of slip occurring in the oceanic mantle. Combining our well-constrained earthquake slip distributions with the causative fault orientation and geometry of the local subduction zone, we hypothesize that the Khash earthquake likely occurred as the combined result of slab-bending forces and dehydration of hydrous minerals along a preexisting fault formed prior to subduction. Key Points The 2013 Khash earthquake rupture half of the subducted oceanic lithosphere Significant mantle moment release is confirmed through independent observations Slab bending and dehydration embrittlement likely caused the earthquake ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896703582&doi=10.1002%2f2013GL058096&partnerID=40&md5=88f059c559c76d2c08837028f7fe59d2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7770
Appears in Collections: 气候减缓与适应
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作者单位: U.S. Geological Survey National Earthquake Information Center, Golden, CO, United States
Recommended Citation:
Barnhart W.D.,Hayes G.P.,Samsonov S.V.,et al. Breaking the oceanic lithosphere of a subducting slab: The 2013 Khash, Iran earthquake[J]. Geophysical Research Letters,2014-01-01,41(1).