DOI: 10.1002/2016GL069381
论文题名: Seismic velocity structure of the Juan de Fuca and Gorda plates revealed by a joint inversion of ambient noise and regional earthquakes
作者: Gao H.
刊名: Geophysical Research Letters
ISSN: 0094-9690
EISSN: 1944-9421
出版年: 2016
卷: 43, 期: 10 起始页码: 5194
结束页码: 5201
语种: 英语
英文关键词: bending fault
; Cascadia subduction zone
; Cobb axial seamount
; Juan de Fuca and Gorda spreading centers
; oceanic lithosphere
; seismic tomography
Scopus关键词: Acoustic noise
; Earthquakes
; Geophysics
; Plates (structural components)
; Seismology
; Shear flow
; Shear waves
; Submarine geology
; Velocity
; Wave propagation
; Bending faults
; Cascadia subduction zone
; Cobb axial seamount
; Juan de Fuca and Gorda spreading centers
; Oceanic lithosphere
; Seismic tomography
; Structural geology
英文摘要: The crust and upper mantle seismic structure, spanning from the Juan de Fuca and Gorda spreading centers to the Cascade back arc, is imaged with full-wave propagation simulation and a joint inversion of ambient noise and regional earthquake recordings. The spreading centers have anomalously low shear wave velocity beneath the oceanic lithosphere. Around the Cobb axial seamount, we observe a low-velocity anomaly underlying a relatively thin oceanic lithosphere, indicating its influence on the Juan de Fuca ridge. The oceanic Moho is clearly defined by a P velocity increase from 6.3 km/s to 7.5 km/s at about 6 km depth beneath the seafloor. The thickness of the oceanic plates is less than 40 km prior to subduction, and the structure of the oceanic lithosphere varies both along strike and along dip. Farther landward, very low velocity anomalies are observed above the plate interface along the Cascade fore arc, indicative of subducted sediments. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978877360&doi=10.1002%2f2016GL069381&partnerID=40&md5=d731142396e0c40db2c8a7d4cdc8d2b9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10653
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: Department of Geosciences, University of Massachusetts Amherst, Amherst, MA, United States
Recommended Citation:
Gao H.. Seismic velocity structure of the Juan de Fuca and Gorda plates revealed by a joint inversion of ambient noise and regional earthquakes[J]. Geophysical Research Letters,2016-01-01,43(10).