DOI: 10.1002/grl.50525
论文题名: The role of hydrous phases in the formation of trench parallel anisotropy: Evidence from Rayleigh waves in Cascadia
作者: Wagner L.S. ; Fouch M.J. ; James D.E. ; Long M.D.
刊名: Geophysical Research Letters
ISSN: 0094-8963
EISSN: 1944-8694
出版年: 2013
卷: 40, 期: 11 起始页码: 2642
结束页码: 2646
语种: 英语
英文关键词: Cascadia
; hydrous phases
; subduction
; Trench parallel anisotropy
Scopus关键词: Anisotropic material
; Cascadia
; Depth sensitivity
; Function of frequency
; Hydrous phasis
; Rayleigh-wave phase velocity
; Seismic anisotropy
; subduction
; Rayleigh waves
; Anisotropy
; phase velocity
; plate tectonics
; Rayleigh wave
; seismic anisotropy
; slab
; subduction zone
; trench
; Cascadia Subduction Zone
; Pacific Ocean
英文摘要: The cause of seismic anisotropy exhibiting trench parallel fast directions in subduction systems has been the subject of significant recent research. We provide new constraints on the contributions of hydrous phases to seismic anisotropy from an unusually well-localized region of trench parallel fast directions in Rayleigh wave phase velocities near the Cascade arc at 45 to 66 s periods. We constrain the location of the anisotropic material to within or directly above the oceanic plate, using the depth sensitivity of Rayleigh waves as a function of frequency and the accurate slab imaging available for Cascadia from scattered wave studies. We infer that the likely source of trench-parallel anisotropy is either a thin layer of sheared hydrous material directly above the slab or hydrated outer rise faults in the upper part of the subducting plate. Similar contributions to trench parallel anisotropy from hydrous phases are likely stronger in other subduction zones. © 2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879990177&doi=10.1002%2fgrl.50525&partnerID=40&md5=0d469ac43c1bbe5559b06c1eb113a533
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6227
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geological Sciences, University of North Carolina at Chapel Hill, CB# 3315, Chapel Hill, NC 27599, United States
Recommended Citation:
Wagner L.S.,Fouch M.J.,James D.E.,et al. The role of hydrous phases in the formation of trench parallel anisotropy: Evidence from Rayleigh waves in Cascadia[J]. Geophysical Research Letters,2013-01-01,40(11).