DOI: 10.1002/grl.50682
论文题名: Low friction along the high slip patch of the 2011 Mw 9.0 Tohoku-Oki earthquake required from the wedge structure and extensional splay faults
作者: Cubas N. ; Avouac J.P. ; Leroy Y.M. ; Pons A.
刊名: Geophysical Research Letters
ISSN: 0094-8639
EISSN: 1944-8370
出版年: 2013
卷: 40, 期: 16 起始页码: 4231
结束页码: 4237
语种: 英语
英文关键词: Coulomb wedge
; dynamic weakening
; frictional properties
; megathrust
; splay fault
; Tohoku-Oki earthquake
Scopus关键词: 2011 Tohoku-Oki earthquakes
; Coulomb wedge
; Frictional properties
; Internal structure
; Megathrust
; Tohoku-Oki earthquakes
; Transient dynamics
; Tsunamigenic potential
; Earthquakes
; Friction
; Mechanical properties
; Pore pressure
; Tribology
; Fault slips
; earthquake rupture
; fault
; fault slip
; faulting
; friction
; geomorphology
; mechanical property
; pressure effect
; thrust
; Tohoku earthquake 2011
; tsunami
英文摘要: We analyze the mechanical properties needed to account for the large shallow slip during the 2011 Tohoku-Oki earthquake and the activation of landward normal faulting within the forearc. We show that the morphology and internal structure of the forearc follows closely the prediction of the critical Coulomb wedge in horizontal compression, implying a high internal pore pressure ratio (λ=0.7+0.14/-0.48) and a low effective basal friction (μbeff=0.14+0.18/-0.04). We then show that the activation of the normal fault requires a lower effective basal friction beneath the outer wedge than beneath the inner wedge (μouter≤0.015), possibly due to transient dynamic weakening associated to the seismic rupture. Forearc normal faults could be considered as evidence for very efficient dynamic weakening along the megathrust and typify megathrust with high tsunamigenic potential. Key Points Long-term high pore pressure and low effective friction along the Megathrust Very efficient dynamic weakening observed along high slip patch Splay faults can be used to typify Megathrust with high tsunamigenic potential. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84882770251&doi=10.1002%2fgrl.50682&partnerID=40&md5=a44e76271e31c20aafb95fabb93cc492
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5903
Appears in Collections: 气候减缓与适应
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作者单位: Tectonics Observatory, Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd, Pasadena, CA 91125, United States
Recommended Citation:
Cubas N.,Avouac J.P.,Leroy Y.M.,et al. Low friction along the high slip patch of the 2011 Mw 9.0 Tohoku-Oki earthquake required from the wedge structure and extensional splay faults[J]. Geophysical Research Letters,2013-01-01,40(16).