DOI: 10.1002/2014GL061096
论文题名: Along-strike variations in the Nankai shallow décollement properties and their implications for tsunami earthquake generation
作者: Park J.-O. ; Naruse H. ; Bangs N.L.
刊名: Geophysical Research Letters
ISSN: 0094-9686
EISSN: 1944-9417
出版年: 2014
卷: 41, 期: 20 起始页码: 7057
结束页码: 7064
语种: 英语
英文关键词: fault property
; Nankai subduction zone
; seismic reflection data
; shallow décollement
; tsunami earthquake
Scopus关键词: Faulting
; Seismic waves
; Seismology
; Tsunamis
; Boundary faults
; Megathrust earthquakes
; Nankai subduction zone
; Reflection characteristics
; Seismic reflection data
; Seismic reflection profiles
; Subduction zones
; Velocity-weakening
; Earthquakes
; earthquake rupture
; fluid pressure
; seismic reflection
; subduction zone
; tsunami
; velocity
; China
; Nankai
; Tianjin
英文摘要: Rupture of slow tsunami earthquakes at subduction zones propagates along a shallow plate-boundary fault (i.e., décollement) nearly all the way to the trench. Seismic reflection profiles reveal that the shallow décollements have variable reflection characteristics in the Nankai subduction zone, allowing us to divide the subduction zone into impedance-decreasing (inferred to be fluid-rich) and impedance-increasing (fluid-poor) décollement regions. The fluid-rich décollement regions with reverse-polarity reflections may play a role as conditionally stable patches because of elevated fluid pressures. In contrast, the fluid-poor décollement regions with normal-polarity reflections could be unstable seismogenic patches with no unusual fluid pressures. We propose that when megathrust earthquakes nucleate at shallow depth, the small unstable fluid-poor patches are prone to slip. They may also accelerate (velocity-weakening) adjacent large, conditionally stable patches, generating large shallow slip and large tsunamis. As a result, along-strike contrast of fault properties can involve large tsunami earthquakes along the Nankai shallow megathrust fault. Key Points Seismic reflection data reveal physical properties of the Nankai decollementAlong-strike contrast of fault properties can involve large tsunami earthquakes ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911425998&doi=10.1002%2f2014GL061096&partnerID=40&md5=19519ce455407af2c90e0930bd173941
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6950
Appears in Collections: 气候减缓与适应
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作者单位: Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan
Recommended Citation:
Park J.-O.,Naruse H.,Bangs N.L.. Along-strike variations in the Nankai shallow décollement properties and their implications for tsunami earthquake generation[J]. Geophysical Research Letters,2014-01-01,41(20).