DOI: 10.1002/2015GL063794
论文题名: Thrust-type focal mechanisms of tectonic tremors in Taiwan: Evidence of subduction
作者: Ide S. ; Yabe S. ; Tai H.-J. ; Chen K.H.
刊名: Geophysical Research Letters
ISSN: 0094-9150
EISSN: 1944-8881
出版年: 2015
卷: 42, 期: 9 起始页码: 3248
结束页码: 3256
语种: 英语
英文关键词: focal mechanism
; subduction
; Taiwan
; tectonic tremor
; very low frequency earthquake
Scopus关键词: Earthquakes
; Faulting
; Frequency bands
; Tectonics
; Focal mechanism
; Subduction
; Taiwan
; Tectonic tremors
; Very low frequency
; Transform faults
; earthquake mechanism
; fluid pressure
; focal mechanism
; moment tensor
; seismic wave
; subduction
; tectonic setting
; Taiwan
英文摘要: Unlike tectonic tremors in subduction zones and along transform faults, the hosting structure for tremors in Taiwan remains debated. Tectonic tremors in Taiwan have been discovered at ∼30km depth beneath the southern Central Range, which is a young and active collisional mountain belt. Here we provide the first evidence for the focal mechanism of tremor using moment tensor inversion in the very low frequency band, employing broadband seismograms stacked relative to the hypocentral time of tremor. The best solution corresponds to low-angle thrust faulting, suggesting the subduction of the Eurasian plate. This mechanism is consistent with strong tidal modulation of tremor activity but differs from the normal-type faulting that dominates regional shallow earthquakes. This result suggests vertical variations in the tectonic stress regime. Thrust faulting may be facilitated by a decrease in normal stress due to the buoyant roots of the mountain belt and local high fluid pressure. Key Points Focal mechanism of tectonic tremors first determined in Taiwan Strong tidal modulation consistent with the focal mechanism Low-angle thrust mechanism suggests slip on the plate interface ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930478790&doi=10.1002%2f2015GL063794&partnerID=40&md5=65a98437668c1ebb1f769c8c1fdeaf25
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8766
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 and Planetary Science, University of Tokyo, Tokyo, Japan
Recommended Citation:
Ide S.,Yabe S.,Tai H.-J.,et al. Thrust-type focal mechanisms of tectonic tremors in Taiwan: Evidence of subduction[J]. Geophysical Research Letters,2015-01-01,42(9).