DOI: 10.1002/grl.50330
论文题名: Small-scale heterogeneities in the oceanic lithosphere inferred from guided waves
作者: Shito A. ; Suetsugu D. ; Furumura T. ; Sugioka H. ; Ito A.
刊名: Geophysical Research Letters
ISSN: 0094-9110
EISSN: 1944-8841
出版年: 2013
卷: 40, 期: 9 起始页码: 1708
结束页码: 1712
语种: 英语
英文关键词: computational seismology
; guided wave
; lithosphere
; oceanic crust
; oceanic lithosphere
Scopus关键词: Broadband ocean-bottom seismometers
; Computational seismologies
; Deep-focus earthquakes
; lithosphere
; Oceanic crust
; Oceanic lithosphere
; Propagation process
; Small-scale heterogeneity
; Earthquakes
; Forward scattering
; Guided electromagnetic wave propagation
; Seismic waves
; Seismographs
; Shear waves
; Wave propagation
; Structural geology
; heterogeneity
; oceanic crust
; oceanic lithosphere
; P-wave
; S-wave
; scattering
; seismic wave
; seismograph
; seismology
; slab
; subduction
; wave propagation
; waveform analysis
; Japan
; Pacific Ocean
英文摘要: We analyze seismic waveforms from deep-focus earthquakes occurring in the subducting slab beneath Japan, recorded by broadband ocean bottom seismometers (BBOBSs) installed on the northwestern Pacific Ocean seafloor. The data reveal waveforms with a low-frequency direct P onset, followed by large-amplitude, high-frequency, long-duration Po and So waves. From the analysis of the BBOBS records and a numerical finite-difference method simulation of seismic wave propagation, we elucidate the generation and propagation processes of such guided waves. We demonstrate that the low-frequency direct P and S waves propagate in the asthenosphere and that the following high-frequency, long-duration Po and So waves are developed by multiple forward scattering of P and S waves. The scattering occurs due to laterally elongated heterogeneities in both the subducting and horizontal parts of the oceanic lithosphere, with the apparent velocities (Vp = 8.1 km/s, Vs = 4.6 km/s) being close to the velocities of oceanic lithosphere. Key PointsPropagation of guided waves in the oceanic lithosphere is numerically simulatedGuided waves propagate as multiple forward scattering due to heterogeneitiesThe random heterogeneities in the oceanic lithosphere are laterally elongated ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879125934&doi=10.1002%2fgrl.50330&partnerID=40&md5=8a8ddf0b2d7dc5918d71eda7af32185d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6374
Appears in Collections: 气候减缓与适应
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作者单位: Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan
Recommended Citation:
Shito A.,Suetsugu D.,Furumura T.,et al. Small-scale heterogeneities in the oceanic lithosphere inferred from guided waves[J]. Geophysical Research Letters,2013-01-01,40(9).