DOI: 10.1002/2015GL067569
论文题名: Nucleation of frictional instability caused by fluid pressurization in subducted blueschist
作者: Sawai M. ; Niemeijer A.R. ; Plümper O. ; Hirose T. ; Spiers C.J.
刊名: Geophysical Research Letters
ISSN: 0094-9223
EISSN: 1944-8954
出版年: 2016
卷: 43, 期: 6 起始页码: 2543
结束页码: 2551
语种: 英语
英文关键词: blueschist
; friction
; pore pressure
; subduction earthquake
Scopus关键词: Earthquakes
; Friction
; Geophysics
; Pore pressure
; Stresses
; Blueschists
; Effective normal stress
; Fluid pressurization
; Frictional behavior
; Influence of fluid
; Potentially unstable
; Seismogenic zones
; Subduction earthquakes
; Faulting
; blueschist facies
; earthquake event
; effective stress
; fault slip
; fluid pressure
; friction
; pore pressure
; subduction
; thrust fault
英文摘要: Pore pressure is an important factor in controlling the slip instability of faults and thus the generation of earthquakes. Particularly slow earthquakes are widespread in subduction zones and usually linked to the occurrence of high pore pressure. Yet the influence of fluid pressure and effective stress on the mechanics of earthquakes is poorly understood. Therefore, we performed shear experiments on blueschist fault rocks, which likely exist at depth in cold and old subduction zones, to investigate the influence of effective stress on frictional behavior. Our results show potentially unstable behavior at temperatures characterizing the seismogenic zone, as well as a transition from stable to unstable behavior with decreasing effective normal stress, which is mechanically equivalent to increasing fluid pressure. This transition is a prerequisite for generating slow earthquakes. Our results imply that high pore pressures are a key factor for nucleating slip leading to both megathrust and slow earthquakes. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977974295&doi=10.1002%2f2015GL067569&partnerID=40&md5=46bfd63905a3da94fdf62e5aea3eaa0b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10186
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: Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Japan
Recommended Citation:
Sawai M.,Niemeijer A.R.,Plümper O.,et al. Nucleation of frictional instability caused by fluid pressurization in subducted blueschist[J]. Geophysical Research Letters,2016-01-01,43(6).