DOI: 10.1002/2016GL070320
论文题名: Spatial coherence of the seismic wavefield continuously recorded by the USArray
作者: Seydoux L. ; Shapiro N.M. ; de Rosny J. ; Landès M.
刊名: Geophysical Research Letters
ISSN: 0094-8640
EISSN: 1944-8371
出版年: 2016
卷: 43, 期: 18 起始页码: 9644
结束页码: 9652
语种: 英语
英文关键词: ambient seismic noise
; array processing
; covariance matrix
; spectral analysis
Scopus关键词: Array processing
; Covariance matrix
; Eigenvalues and eigenfunctions
; Seismology
; Spectrum analysis
; Surface waves
; Ambient seismic noise
; Array covariance matrices
; Coherent waves
; Quasi-monochromatic
; Seismic wavefields
; Spatial coherence
; Strong earthquakes
; Teleseismic sources
; Earthquakes
英文摘要: We use a method based on the array covariance matrix eigenvalues to study the level of spatial coherence and of isotropy of the seismic wavefield continuously recorded during 2010 by the USArray. First, we observe that the raw data are often dominated by local sources. To remove their influence, we apply spectral and temporal normalizations to the input signals. We notice that this widely used preprocessing in ambient-noise seismology does not fully homogenize the seismic wavefield and that some strongly coherent arrivals persist. Among these persistent signals generated by teleseismic sources we detect (1) seismic waves emitted by strong earthquakes, (2) a nearly continuous quasi-monochromatic signal at 26 s period, and (3) multiday coherent wave trends in the spectral band of oceanic microseisms (0.07–0.2 Hz). For the latter, beamforming analysis shows that while most of the signals are composed of surface waves, some are dominated by body waves likely generated in the deep ocean. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84990178749&doi=10.1002%2f2016GL070320&partnerID=40&md5=c19d287dcd3590cac1e51160e52a8f9e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9603
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 Seismology, Institut de Physique du Globe de Paris, Paris, France
Recommended Citation:
Seydoux L.,Shapiro N.M.,de Rosny J.,et al. Spatial coherence of the seismic wavefield continuously recorded by the USArray[J]. Geophysical Research Letters,2016-01-01,43(18).