| DOI: | 10.1002/2014GL060690
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| 论文题名: | Seismic velocity changes caused by the Earth tide: Ambient noise correlation analyses of small-array data |
| 作者: | Takano T.; Nishimura T.; Nakahara H.; Ohta Y.; Tanaka S.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9816
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| EISSN: | 1944-9547
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| 出版年: | 2014
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| 卷: | 41, 期:17 | | 起始页码: | 6131
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| 结束页码: | 6136
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| 语种: | 英语
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| Scopus关键词: | Seismic waves
; Strain
; Tide gages
; Tides
; Velocity
; Almost consistent
; Ambient seismic noise
; Artificial sources
; Cross-correlation function
; Seismic velocities
; Shallow subsurface
; Strain sensitivity
; Volumetric strain
; Seismology
; array
; data set
; noise
; seismic anisotropy
; seismic noise
; seismic velocity
; strain
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| 英文摘要: | We examine seismic velocity changes due to the Earth tide by conducting cross-correlation function (CCF) analyses of ambient seismic noise recorded at a small array composed of seven seismometers in northeastern Japan. We calculate CCFs for the dilatational and contractional episodes that are predicted from theoretical tidal volumetric strains. CCFs of the two episodes are highly correlated, but tiny differences are found in their phases. The phase differences are explained by seismic velocity changes of -0.19± 0.06% at 1-2 Hz, which are interpreted to be caused by opening/closure of cracks or pores in the shallow subsurface due to the tidal strain. Strain sensitivities of the seismic velocity changes are estimated to be 6.9× 104 strain-1, which are almost consistent with those reported in previous studies using artificial sources. © 2014. American Geophysical Union. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84907945400&doi=10.1002%2f2014GL060690&partnerID=40&md5=cdd212c0df7ff155d998e4adeddbe1d7
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7080
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
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| Recommended Citation: | |
Takano T.,Nishimura T.,Nakahara H.,et al. Seismic velocity changes caused by the Earth tide: Ambient noise correlation analyses of small-array data[J]. Geophysical Research Letters,2014-01-01,41(17).
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