气候变化领域集成服务门户(CCPortal): Influence of a Subducted Oceanic Ridge on the Distribution of Shallow VLFEs in the Nankai Trough as Revealed by Moment Tensor Inversion and Cluster Analysis

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DOI	10.1029/2020GL087244
	Influence of a Subducted Oceanic Ridge on the Distribution of Shallow VLFEs in the Nankai Trough as Revealed by Moment Tensor Inversion and Cluster Analysis
	Toh A.; Chen W.J.; Takeuchi N.; Dreger D.S.; Chi W.C.; Ide S.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	The eastern Nankai Trough is a unique site where many shallow, very low frequency earthquakes (sVLFEs) are recorded by nearby broadband ocean bottom seismometers. Here, we estimated the locations and seismic moment tensors (MTs) of sVLFEs based on the low-frequency (<0.07 Hz) components of the records. Although some sVLFEs exhibited long-duration signals (>100 s), indicating a degree of source complexity, the MT inversions were limited to events with impulsive and short durations (20–30 s). Nevertheless, cluster analysis confirmed that the MTs of impulsive sVLFEs reasonably represented the overall deformation for an event group including many longer-duration events. The distribution of MTs indicates that deformations associated with sVLFEs are influenced by a subducted oceanic ridge in this region, which produces an along-the-trough variation in a strain accumulation/release pattern and probably controls the spatial patterns of tsunami generation. ©2020. The Authors.
英文关键词	Cluster analysis; Deformation; Earthquakes; Broadband ocean-bottom seismometers; Moment tensor inversion; Seismic moment tensor; Source complexity; Spatial patterns; Strain accumulations; Tsunami generation; Very low frequency; Tensors; cluster analysis; deformation mechanism; moment tensor; seafloor; seismic moment; seismometry; subduction; trough; tsunami event; Nankai Trough; Pacific Ocean
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169992
作者单位	Department of Earth and Planetary Science, University of Tokyo, Tokyo, Japan; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; Earthquake Research Institute, University of Tokyo, Tokyo, Japan; Berkeley Seismological Laboratory, University of California, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Toh A.,Chen W.J.,Takeuchi N.,et al. Influence of a Subducted Oceanic Ridge on the Distribution of Shallow VLFEs in the Nankai Trough as Revealed by Moment Tensor Inversion and Cluster Analysis[J],2020,47(15).
APA	Toh A.,Chen W.J.,Takeuchi N.,Dreger D.S.,Chi W.C.,&Ide S..(2020).Influence of a Subducted Oceanic Ridge on the Distribution of Shallow VLFEs in the Nankai Trough as Revealed by Moment Tensor Inversion and Cluster Analysis.Geophysical Research Letters,47(15).
MLA	Toh A.,et al."Influence of a Subducted Oceanic Ridge on the Distribution of Shallow VLFEs in the Nankai Trough as Revealed by Moment Tensor Inversion and Cluster Analysis".Geophysical Research Letters 47.15(2020).