DOI: 10.1002/2016GL070083
论文题名: Finite-frequency wave propagation through outer rise fault zones and seismic measurements of upper mantle hydration
作者: Miller N.C. ; Lizarralde D.
刊名: Geophysical Research Letters
ISSN: 0094-8819
EISSN: 1944-8550
出版年: 2016
卷: 43, 期: 15 起始页码: 7982
结束页码: 7990
语种: 英语
英文关键词: outer rise faulting
; seismic anisotropy
; serpentinization
Scopus关键词: Acoustic waves
; Acoustics
; Hydration
; Seismology
; Serpentine
; Silicate minerals
; Tomography
; Acoustic wave propagation models
; Finite frequencies
; Middle America trenches
; Seismic anisotropy
; Seismic measurements
; Serpentinization
; Tomographic images
; Uniform distribution
; Acoustic wave propagation
; acoustic wave
; fault zone
; faulting
; seismic anisotropy
; seismic method
; seismic wave
; serpentinization
; subduction zone
; upper mantle
; wave direction
; wave modeling
; wave propagation
; wave velocity
; wavelength
; Middle America Trench
; Pacific Ocean
英文摘要: Effects of serpentine-filled fault zones on seismic wave propagation in the upper mantle at the outer rise of subduction zones are evaluated using acoustic wave propagation models. Modeled wave speeds depend on azimuth, with slowest speeds in the fault-normal direction. Propagation is fastest along faults, but, for fault widths on the order of the seismic wavelength, apparent wave speeds in this direction depend on frequency. For the 5–12 Hz Pn arrivals used in tomographic studies, joint-parallel wavefronts are slowed by joints. This delay can account for the slowing seen in tomographic images of the outer rise upper mantle. At the Middle America Trench, confining serpentine to fault zones, as opposed to a uniform distribution, reduces estimates of bulk upper mantle hydration from ~3.5 wt % to as low as 0.33 wt % H2O. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84981299185&doi=10.1002%2f2016GL070083&partnerID=40&md5=d2fd49760e27c75f9e8b69fac2dcf2b8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9782
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: U.S. Geological Survey, Woods Hole Science Center, Woods Hole, MA, United States
Recommended Citation:
Miller N.C.,Lizarralde D.. Finite-frequency wave propagation through outer rise fault zones and seismic measurements of upper mantle hydration[J]. Geophysical Research Letters,2016-01-01,43(15).