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DOI | 10.1029/2019GL082468 |
Tremor and Inferred Slow Silo Associated With Afterslip of the 2011 Tohoku Earthquake | |
Ohta, Kazuaki1; Ito, Yoshihiro1; Hino, Ryota2; Ohyanagi, Shukei1; Matsuzawa, Takanori3; Shiobara, Hajime4; Shinohara, Masanao4 | |
2019-05-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:9页码:4591-4598 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | Characterizing shallow interplate slip is essential for modeling the potential generation of megathrust earthquakes and tsunamis. Large postseismic crustal deformation caused by the 2011 Tohoku-Oki earthquake suggests the occurrence of shallow afterslip, but it is unclear what kind of slip is dominant at the shallow plate interface. Here we report episodic tremor activity south of the primary rupture area based on ocean bottom seismometer observations. Five tremor episodes with recurrence intervals of similar to 60 days show migration behavior and shear mechanisms consistent with plate subduction, indicating the occurrences of the episodic slow slip events in the vicinity of the afterslip area. The association of slow slip events and afterslip sheds new light on the frictional nature and stress state of shallow megathrusts and may help predict the possible rupture extent of future earthquakes. Plain Language Summary Understanding the slip characteristics in the shallow part of subduction zone is essential to evaluate the potential risk of megathrust earthquakes and tsunamis. It remains unclear, however, what type of slip occurs at the shallow plate interface due to the difficulty in observing offshore seismic activity. In this paper, we report newly discovered tremor and slow slip activity in the afterslip region where coseimic rupture did not happen during the 2011 Tohoku-Oki earthquake, based on a new campaign ocean bottom seismometer observation. We propose that the tremor and slow slip region illuminate the boundary between fast coseismic slip and stable aseismic slip that could limit the rupture extent of future megathrust earthquakes. The observed tremor and slow slip activities also suggest that the interplate stress state has been recovered to the level of that before the Tohoku earthquake. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000468869500006 |
WOS关键词 | JAPAN SUBDUCTION ZONE ; SLIP EVENTS ; VISCOELASTIC RELAXATION ; PROPAGATION ; PLATE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/183242 |
专题 | 气候变化 |
作者单位 | 1.Kyoto Univ, Disaster Prevent Res Inst, Uji, Kyoto, Japan; 2.Tohoku Univ, Grad Sch Sci, Sendai, Miyagi, Japan; 3.Natl Res Inst Earth Sci & Disaster Resilience, Tsukuba, Ibaraki, Japan; 4.Univ Tokyo, Earthquake Res Inst, Tokyo, Japan |
推荐引用方式 GB/T 7714 | Ohta, Kazuaki,Ito, Yoshihiro,Hino, Ryota,et al. Tremor and Inferred Slow Silo Associated With Afterslip of the 2011 Tohoku Earthquake[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(9):4591-4598. |
APA | Ohta, Kazuaki.,Ito, Yoshihiro.,Hino, Ryota.,Ohyanagi, Shukei.,Matsuzawa, Takanori.,...&Shinohara, Masanao.(2019).Tremor and Inferred Slow Silo Associated With Afterslip of the 2011 Tohoku Earthquake.GEOPHYSICAL RESEARCH LETTERS,46(9),4591-4598. |
MLA | Ohta, Kazuaki,et al."Tremor and Inferred Slow Silo Associated With Afterslip of the 2011 Tohoku Earthquake".GEOPHYSICAL RESEARCH LETTERS 46.9(2019):4591-4598. |
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