气候变化领域集成服务门户(CCPortal): Variations in the Characteristic Amplitude of Tectonic Tremor Induced by Long-Term Slow Slip Events

CCPortal

DOI	10.1029/2020JB021138
	Variations in the Characteristic Amplitude of Tectonic Tremor Induced by Long-Term Slow Slip Events
	Nakamoto K.; Hiramatsu Y.; Matsuzawa T.; Mizukami T.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Long-term slow slip events (L-SSEs) often excite short-term slow slips events (S-SSEs) and tectonic tremor in the zone of episodic tremor and slip (ETS). However, the factors controlling the occurrence of primary versus excited tremor events remain unclear. To elucidate these factors, we analyzed tectonic tremor events in and around the Bungo Channel (Nankai subduction zone), where L-SSEs are known to excite tremor and S-SSEs in the ETS zone. We focused on the spatial distribution of the characteristic amplitude (CA) of tremor, determined from the duration-amplitude distributions of tremor events, as an indicator of the properties of the tremor source. CAs are large in L-SSE slip areas and small in adjacent areas. The difference between CA values during tremor-excitation periods (L-SSEs) and the intervening periods (ΔCA) is positive in the slip area, negative in adjacent areas, and tends toward zero in the far field. We suggest that the heterogeneous distributions of CA and ΔCA reflect the heterogeneous effective strengths of tremor patches, which might be related to petrological properties, and stress and pore-fluid pressure variations induced by L-SSEs, respectively. The upward migration of fluid from the ETS zone along the plate interface might modulate the effective stress and strength states of tremor patches during L-SSEs. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Duration-amplitude distribution; fluid migration; pore fluid pressure; tremor patch
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187133
作者单位	Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Japan; School of Geosciences and Civil Engineering, College of Science and Engineering, Kanazawa University, Kanazawa, Japan; National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan
推荐引用方式 GB/T 7714	Nakamoto K.,Hiramatsu Y.,Matsuzawa T.,et al. Variations in the Characteristic Amplitude of Tectonic Tremor Induced by Long-Term Slow Slip Events[J],2021,126(5).
APA	Nakamoto K.,Hiramatsu Y.,Matsuzawa T.,&Mizukami T..(2021).Variations in the Characteristic Amplitude of Tectonic Tremor Induced by Long-Term Slow Slip Events.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Nakamoto K.,et al."Variations in the Characteristic Amplitude of Tectonic Tremor Induced by Long-Term Slow Slip Events".Journal of Geophysical Research: Solid Earth 126.5(2021).