DOI: 10.1002/grl.50832
论文题名: Evidence for tidal triggering of high-amplitude rapid tremor reversals and tremor streaks in northern Cascadia
作者: Thomas T.W. ; Vidale J.E. ; Houston H. ; Creager K.C. ; Sweet J.R. ; Ghosh A.
刊名: Geophysical Research Letters
ISSN: 0094-8654
EISSN: 1944-8385
出版年: 2013
卷: 40, 期: 16 起始页码: 4254
结束页码: 4259
语种: 英语
英文关键词: Cascadia subduction zone
; episodic tremor and slip
; slow earthquake
; tectonic tremor
Scopus关键词: Back-projection
; Cascadia subduction zone
; Earthquake slip
; episodic tremor and slip
; High resolution
; Tectonic tremors
; Tidal loadings
; Tidal stress
; Earthquakes
; Faulting
; Shear stress
; Loading
; amplitude
; array
; earthquake epicenter
; earthquake trigger
; shear stress
; slip
; spatiotemporal analysis
; thrust
; tidal cycle
; Cascadia Subduction Zone
; Pacific Ocean
英文摘要: We provide a new link between tectonic tremor propagation, tremor amplitude, and tidal stresses by analyzing high-resolution tremor locations and amplitudes determined by multibeam backprojection of data from an array of subarrays. For two Cascadia episodic tremor and slip events, we observe repeating, high-amplitude rapid tremor reversals (RTRs) and tremor streaks. They tend to occur when tremor amplitudes are highest and occur almost exclusively during periods of thrust-encouraging, tidally induced shear stress on the fault. We speculate that thrust-encouraging shear stress from tidal loading forces trigger RTRs and streaks that energetically rerupture the weakened fault behind the slow slip front. The high rate and amplitude of tremor during RTRs and streaks stands in contrast to the hypothesis that activity at the leading edge of the slow slip zone is the most energetic and loudest. This implies that the spatiotemportal pattern of slow earthquake slip migration is even more intricate than previously reported. Key Points RTR's and streaks are high in amplitude relative to tremor at the slip front RTR's and streaks occur during slip-encouraging tidal shear stress RTR's and streaks may be triggered by tidal loading and tidal stresses. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883114177&doi=10.1002%2fgrl.50832&partnerID=40&md5=3836ef399080a37e45c5b8d60467b1ca
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5918
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Space Sciences, University of Washington, Johnson Hall 070, 4000 15th Ave. NE, Seattle, WA 98195-1310, United States
Recommended Citation:
Thomas T.W.,Vidale J.E.,Houston H.,et al. Evidence for tidal triggering of high-amplitude rapid tremor reversals and tremor streaks in northern Cascadia[J]. Geophysical Research Letters,2013-01-01,40(16).