@article{64b98909786e447a8744db7f7979ef53,
title = "Tremor and Inferred Slow Slip Associated With Afterslip of the 2011 Tohoku Earthquake",
abstract = "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 ~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.",
keywords = "Japan trench, Tohoku earthquake, afterslip, slow slip, subduction zone, tremor",
author = "Kazuaki Ohta and Yoshihiro Ito and Ryota Hino and Shukei Ohyanagi and Takanori Matsuzawa and Hajime Shiobara and Masanao Shinohara",
note = "Funding Information: We thank T. Iinuma for providing the coseismic and afterslip distribution data of the Tohoku earthquake. We also thank R. Azuma, M. Sato, R. Yamamoto, H. Takahashi, Kido, M., T. Yagi, T. Kanamatsu, K. Arai, K. Ikehara, V. Hj{\"o}rleifsd{\'o}ttir, Y. Arakawa, Y. Sato, M. Imano, R. Matsui, T. Nishimori, Y. Nishimagi, Y. Tanaka, K. Ikezawa, E. S. Garcia, R. Fukuchi, O. C. Kopuz, Y. Nakano, and the crews of R/V Shinsei‐maru (JAMSTEC) for the acquisition of the ocean bottom seismometer data in cruises KS16‐14 and KS17‐13. We also thank the anonymous reviewers for their careful reading of our manuscript and their constructive and helpful comments. This work was supported by JSPS KAKENHI (grants 26000002, 26257206, JP16H06477) and JST‐JICA SATREPS (15543611). Authors declare no competing interests. All data needed to evaluate the conclusions in the paper are present in the paper and/or the supporting information. Additional data related to this paper may be requested from the authors. Funding Information: We thank T. Iinuma for providing the coseismic and afterslip distribution data of the Tohoku earthquake. We also thank R. Azuma, M. Sato, R. Yamamoto, H. Takahashi, Kido, M., T. Yagi, T. Kanamatsu, K. Arai, K. Ikehara, V. Hj?rleifsd?ttir, Y. Arakawa, Y. Sato, M. Imano, R. Matsui, T. Nishimori, Y. Nishimagi, Y. Tanaka, K. Ikezawa, E. S. Garcia, R. Fukuchi, O. C. Kopuz, Y. Nakano, and the crews of R/V Shinsei-maru (JAMSTEC) for the acquisition of the ocean bottom seismometer data in cruises KS16-14 and KS17-13. We also thank the anonymous reviewers for their careful reading of our manuscript and their constructive and helpful comments. This work was supported by JSPS KAKENHI (grants 26000002, 26257206, JP16H06477) and JST-JICA SATREPS (15543611). Authors declare no competing interests. All data needed to evaluate the conclusions in the paper are present in the paper and/or the supporting information. Additional data related to this paper may be requested from the authors. Publisher Copyright: {\textcopyright}2019. American Geophysical Union. All Rights Reserved.",
year = "2019",
month = may,
day = "16",
doi = "10.1029/2019GL082468",
language = "English",
volume = "46",
pages = "4591--4598",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "9",
}