DOI: 10.1002/grl.50175
论文题名: Geological and frictional aspects of very-low-frequency earthquakes in an accretionary prism
作者: Saito T. ; Ujiie K. ; Tsutsumi A. ; Kameda J. ; Shibazaki B.
刊名: Geophysical Research Letters
ISSN: 0094-9289
EISSN: 1944-9020
出版年: 2013
卷: 40, 期: 4 起始页码: 703
结束页码: 708
语种: 英语
英文关键词: Accretionary prism
; Frictional velocity dependence
; Subduction zone
; Very-low-frequency earthquakes
Scopus关键词: Earthquakes
; Friction
; Materials properties
; Prisms
; Quartz
; Tectonics
; Velocity
; Accretionary complex
; Accretionary prism
; Frictional properties
; Frictional velocity
; Microstructural analysis
; Shear localizations
; Subduction zones
; Very low frequency
; Shear flow
; clay
; earthquake
; fault propagation
; frequency analysis
; sampling
; shear zone
; slip rate
; subduction
; thrust fault
; velocity profile
英文摘要: Very-low-frequency earthquakes (VLFE) occur within accretionary prisms and near subduction plate boundaries at slip rates of 0.05-2 mm/s. However, the geological and frictional aspects of VLFE remain poorly understood. The thrusts in the Shimanto accretionary complex exhumed from source depths of VLFE are composed of quartz-rich fault rocks with or without clay foliations. We examined the frictional velocity dependence of thrust materials. At slip rates of 0.0028-0.28 mm/s, the powder sample from non-foliated fault rock shows velocity-weakening behavior, while that from foliated fault rock exhibits velocity-strengthening behavior. Both samples show velocity-strengthening behavior at slip rates of 0.28-2.8 mm/s. Microstructural analysis reveals that the velocity-weakening sample shows a shear localization, while the velocity-strengthening sample is marked by clay foliations oblique and parallel to shear zone boundaries. Our results imply that frictional instability generates along quartz-rich fault rock but slip becomes stable at higher slip rates, regardless of mineral composition. This is favorable for the occurrence of VLFE in subduction zones. Key Points Quartz-rich fault rock exhibits velocity-weakening behavior Quartz-rich fault rock is not unusual in accretionary prisms Frictional properties of thrust materials may explain the occurrence of VLFE ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878180698&doi=10.1002%2fgrl.50175&partnerID=40&md5=07515e1dc9051a2474bd70fe0084706f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6553
Appears in Collections: 气候减缓与适应
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作者单位: Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
Recommended Citation:
Saito T.,Ujiie K.,Tsutsumi A.,et al. Geological and frictional aspects of very-low-frequency earthquakes in an accretionary prism[J]. Geophysical Research Letters,2013-01-01,40(4).