DOI: 10.1002/2015GL067249
论文题名: Determination of focal mechanisms of nonvolcanic tremor using S wave polarization data corrected for the effects of anisotropy
作者: Imanishi K. ; Uchide T. ; Takeda N.
刊名: Geophysical Research Letters
ISSN: 0094-9439
EISSN: 1944-9170
出版年: 2016
卷: 43, 期: 2 起始页码: 611
结束页码: 619
语种: 英语
英文关键词: focal mechanism
; Nankai subduction zone
; nonvolcanic tremor
; S wave polarization
; shear wave splitting
Scopus关键词: Anisotropy
; Polarization
; Shear flow
; Viscosity measurement
; Focal mechanism
; Nankai subduction zone
; Non-volcanic tremors
; S-waves
; Shear wave splitting
; Shear waves
; focal mechanism
; polarization
; S-wave
; seismic anisotropy
; spatial distribution
; temporal variation
; wave splitting
; Honshu
; Japan
; Kii Peninsula
; Kinki
英文摘要: We propose a method to determine the focal mechanisms of nonvolcanic tremors using anisotropy-corrected S polarizations measured directly from noisy tremor signals. The successful retrieval of polarization angles in noisy signals owes much to the observation that, in general, tremors propagate slowly and therefore do not change their location immediately. This feature of tremors enables us to use longer time windows to compute polarization angles (e.g., 1 min or longer), resulting in a stack of particle motions. We applied the method to a tremor episode that occurred beneath the Kii Peninsula in April 2013. Although the majority of inferred focal mechanisms suggested that tremors manifest shear slip on the plate interface, some events with strike-slip components were also found to have occurred. The proposed method provides us with a tool for investigating smaller-scale spatial distributions and temporal variations of focal mechanisms throughout tremor zones. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84958036465&doi=10.1002%2f2015GL067249&partnerID=40&md5=2071e8c833bf3aefff126c97d4840bd2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10402
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: Geological Survey of Japan, AIST, Tsukuba, Japan
Recommended Citation:
Imanishi K.,Uchide T.,Takeda N.. Determination of focal mechanisms of nonvolcanic tremor using S wave polarization data corrected for the effects of anisotropy[J]. Geophysical Research Letters,2016-01-01,43(2).