气候变化领域集成服务门户(CCPortal): Comprehensive Detection of Very Low Frequency Earthquakes Off the Hokkaido and Tohoku Pacific Coasts, Northeastern Japan

CCPortal

DOI	10.1029/2019JB017988
	Comprehensive Detection of Very Low Frequency Earthquakes Off the Hokkaido and Tohoku Pacific Coasts, Northeastern Japan
	Baba S.; Takeo A.; Obara K.; Matsuzawa T.; Maeda T.
发表日期	2020
ISSN	21699313
卷号	125 期号:1
英文摘要	Very low frequency earthquakes (VLFEs), classified as one type of slow earthquake, occur near seismogenic zones and can be a proxy for interplate slow slip. We investigated VLFE activity off the Hokkaido and Tohoku Pacific coasts, where the Pacific plate subducts under the North American plate. Comprehensive detection of VLFEs is performed for the period from January 2003 to July 2018 by a matched-filter technique utilizing synthetic waveforms calculated based on a three-dimensional velocity structure model. The spatiotemporal consistency between the afterslip of the 2003 Tokachi-Oki earthquake (Mw 8.0) and VLFE distribution off the Hokkaido coast suggests that VLFE activity can reflect interplate slow slip. Inside a large coseismic slip area of the 2011 Tohoku earthquake (Mw 9.0), the VLFE activity was low thereafter, whereas outside the area, VLFE activity increased after the 2011 Tohoku earthquake. These characteristics are consistent with aseismic slip distributions estimated from repeating earthquakes. VLFEs were sometimes activated by afterslips of interplate earthquakes with Mw of 6–7, such as the 2008 Fukushima-Oki earthquake and aftershocks of the 2011 Tohoku earthquake. Even in the coseismic slip areas of very large earthquakes, we found the occurrence of episodic bursts every 3 months to a year during an interseismic period between very large earthquakes. Such VLFE bursts may suggest small slips during the interseismic period. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	matched-filter technique; Slow earthquake; Tohoku earthquake afterslip; Very low frequency earthquake
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/188029
作者单位	Earthquake Research Institute, The University of Tokyo, Tokyo, Japan; National Research Institute for Earth Science and Disaster Resilience, Ibaraki, Japan; Graduate School of Science and Technology, Hirosaki University, Aomori, Japan
推荐引用方式 GB/T 7714	Baba S.,Takeo A.,Obara K.,et al. Comprehensive Detection of Very Low Frequency Earthquakes Off the Hokkaido and Tohoku Pacific Coasts, Northeastern Japan[J],2020,125(1).
APA	Baba S.,Takeo A.,Obara K.,Matsuzawa T.,&Maeda T..(2020).Comprehensive Detection of Very Low Frequency Earthquakes Off the Hokkaido and Tohoku Pacific Coasts, Northeastern Japan.Journal of Geophysical Research: Solid Earth,125(1).
MLA	Baba S.,et al."Comprehensive Detection of Very Low Frequency Earthquakes Off the Hokkaido and Tohoku Pacific Coasts, Northeastern Japan".Journal of Geophysical Research: Solid Earth 125.1(2020).