DOI: 10.1002/grl.50298
论文题名: Numerical simulations on megathrust rupture stabilized under strong dilatancy strengthening in slow slip region
作者: Liu Y.
刊名: Geophysical Research Letters
ISSN: 0094-9188
EISSN: 1944-8919
出版年: 2013
卷: 40, 期: 7 起始页码: 1311
结束页码: 1316
语种: 英语
英文关键词: dilatancy strengthening
; megathrust rupture
; slow slip events
Scopus关键词: Depth distribution
; Episodic slow slips
; Megathrust
; Recurrence intervals
; Seismogenic zones
; Slow slip events
; Stability transition
; Subduction zones
; Faulting
; Seismographs
; Spatial distribution
; Friction
; coseismic process
; dilatancy
; episodic event
; fault
; numerical model
; pore pressure
; rupture
; slip
; spatial distribution
; subduction zone
; thrust
英文摘要: Episodic slow slip events (SSEs) typically involve a few millimeters to centimeters of slip over several days to months at depths near or further downdip of megathrust seismogenic zones. Despite its widespread presence in subduction margins, it remains unknown how SSEs interact with the seismogenic zone and affect megathrust ruptures. Here, I construct a 2-D thrust fault model governed by rate-state friction to investigate how fault dilatancy influences the amplitude and spatial distribution of' coseismic slip, afterslip, and SSEs. Model results illustrate that, under strong dilatancy and high pore pressure around the friction stability transition, coseismic rupture stops at the onset of SSEs. Modeled SSEs have lower velocities, longer recurrence intervals and durations, and larger slip amounts as dilatancy becomes stronger, demonstrating a transition from short-term to long-term type of SSE behavior. These results qualitatively explain the range of spatial distributions of SSEs and megathrust ruptures observed or inferred in natural subduction zones. Furthermore, the relative depths of SSEs and megathrust afterslip may serve as an indicator of dilatancy effectiveness. Key Points Slow slip events can mark megathrust rupture limit under strong dilatancy. Short-term SSEs transition to long-term SSEs as dilatancy effect increases. Depth distributions of SSEs and afterslip may indicate dilatancy effectiveness. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876893793&doi=10.1002%2fgrl.50298&partnerID=40&md5=64d2414bd032fe7b5b33f312d8aec8be
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6452
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Planetary Sciences, McGill University, 3450 University, 339 FD Adams, Montreal, QC, Canada
Recommended Citation:
Liu Y.. Numerical simulations on megathrust rupture stabilized under strong dilatancy strengthening in slow slip region[J]. Geophysical Research Letters,2013-01-01,40(7).