气候变化领域集成服务门户(CCPortal): Similarities and Differences in the Rupture Processes of the 1952 and 2003 Tokachi-Oki Earthquakes

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DOI	10.1029/2020JB020585
	Similarities and Differences in the Rupture Processes of the 1952 and 2003 Tokachi-Oki Earthquakes
	Kobayashi H.; Koketsu K.; Miyake H.; Kanamori H.
发表日期	2021
ISSN	21699313
卷号	126 期号:1
英文摘要	We investigated the similarities and differences between the rupture processes of the 1952 and 2003 Tokachi-oki earthquakes (Mw ∼ 8) that occurred 51 years apart in the southernmost region of the Kuril subduction zone. This event pair is rare because seismic waveforms of both events were instrumentally recorded. We performed joint source inversion analyses of both earthquakes to better understand the rupture processes of this earthquake sequence. The dataset for the 1952 earthquake consists of teleseismic and strong motion data which were obtained by digitizing copies of analog seismograms. Two datasets were made for the 2003 earthquake to examine the effect of data limitation and to facilitate a comparison of the inversion results of the two earthquakes. One dataset consists of a large amount of teleseismic, strong motion, and geodetic data. The other dataset is similar to that of the 1952 earthquake. Our results show that the rupture propagation, slip areas, and maximum slip amounts were similar for the 1952 and 2003 earthquakes in the Tokachi-oki region. However, there are two important differences: the 1952 earthquake was initiated by an Mw 6.1 subevent in the Tokachi-oki region, and its rupture extended to the adjacent Akkeshi-oki region. The similarity in the rupture pattern of the M8-class earthquake pair suggests the persistence of asperities on the plate interface, while the differences imply a degree of variability in the initiation and termination of the cascading rupture process. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	asperity; cascading rupture; historical seismogram; joint source inversion
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/187399
作者单位	Earthquake Research Institute, University of Tokyo, Tokyo, Japan; Now at Kobori Research Complex Inc., Tokyo, Japan; Seismological Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Kobayashi H.,Koketsu K.,Miyake H.,et al. Similarities and Differences in the Rupture Processes of the 1952 and 2003 Tokachi-Oki Earthquakes[J],2021,126(1).
APA	Kobayashi H.,Koketsu K.,Miyake H.,&Kanamori H..(2021).Similarities and Differences in the Rupture Processes of the 1952 and 2003 Tokachi-Oki Earthquakes.Journal of Geophysical Research: Solid Earth,126(1).
MLA	Kobayashi H.,et al."Similarities and Differences in the Rupture Processes of the 1952 and 2003 Tokachi-Oki Earthquakes".Journal of Geophysical Research: Solid Earth 126.1(2021).