DOI: 10.1002/2014GL062614
论文题名: Crustal anisotropy from tectonic tremor under Washington State in the Cascadia
作者: Huesca-Pérez E. ; Ghosh A.
刊名: Geophysical Research Letters
ISSN: 0094-8777
EISSN: 1944-8508
出版年: 2015
卷: 42, 期: 7 起始页码: 2228
结束页码: 2234
语种: 英语
英文关键词: Cascadia
; crustal anisotropy
; nonvolcanic tremor
Scopus关键词: Anisotropy
; Earthquakes
; Polarization
; Shear flow
; Shear waves
; Tectonics
; Anisotropy parameters
; Broad-band seismic stations
; Cascadia
; Crustal anisotropy
; Crustal earthquakes
; Non-volcanic tremors
; Polarization direction
; Shear-wave anisotropy
; Faulting
; anisotropy
; continental crust
; crustal movement
; S-wave
; volcanic earthquake
; United States
; Washington [United States]
英文摘要: We present new observations of crustal shear wave anisotropy extracted from nonvolcanic tremor in Cascadia under Washington State. Measurements of crustal anisotropy are extremely sparse and limited in this area mainly due to low level of seismicity. Abundance of tremor activity during slow earthquakes offers a unique opportunity to measure anisotropy parameters of the continental crust using tremor signal. To accomplish this, polarization and splitting analyses of nonvolcanic tremor are performed using three-component broadband seismic stations. Splitting times measurements range between 0.08 and 0.17 s and similar to the splitting magnitude typically observed in the continental crust. Fast direction of shear wave anisotropy generally trends ESE-WNW. Fast polarization directions are, in general, perpendicular to the prevailing maximum compressive stress field but tend to be parallel to several mapped EW and ESE-WNW trending faults in this area. The observed spatial pattern of anisotropy is likely controlled by faulting that accommodates NS compression resulting from the tectonic movement of the Oregon block toward north. Existence of several EW trending crustal faults and source parameters of crustal earthquakes at depth, consistent with the regional stress regime, indicate that these faults may be the dominant factor causing the observed pattern of shear wave anisotropy ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84928699494&doi=10.1002%2f2014GL062614&partnerID=40&md5=6ed537064bea109c5f942e3b49388ad7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8393
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 Earth Sciences, University of California, Riverside, CA, United States
Recommended Citation:
Huesca-Pérez E.,Ghosh A.. Crustal anisotropy from tectonic tremor under Washington State in the Cascadia[J]. Geophysical Research Letters,2015-01-01,42(7).