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Cohesional Slip on a Plate Subduction Boundary During a Large Earthquake

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Title: Cohesional Slip on a Plate Subduction Boundary During a Large Earthquake
Authors: Kameda, Jun Browse this author
Hamada, Yohei Browse this author
Keywords: 2011 Tohoku-Oki earthquake
plate boundary fault
Issue Date: 28-Sep-2020
Publisher: American Geophysical Union
Journal Title: Geophysical research letters
Volume: 47
Issue: 18
Start Page: e2020GL088395
Publisher DOI: 10.1029/2020GL088395
Abstract: The frontal part of the Japan Trench plate boundary fault, which slipped during the 2011 Tohoku-Oki earthquake (M(w)9.0), is enriched in smectite and is intrinsically weak owing to the high swelling pressure of this mineral. Our rheometric experiments using analog fault materials demonstrate that "cohesional slip," rather than frictional slip, is a realistic faulting process in the studied fault zone. The cohesional slip can be described by the Bingham plastic model. Consequently, the coseismic shear stress is described by the yield stress and plastic viscosity. Comparison of the results with the average shear stress derived from a previous study suggests that the slip zone thickness for cohesional slip is similar to 1.3 cm or less. This finding is consistent with textures characterized by discrete slip planes of comparable thickness observed in the recovered fault rocks, suggesting that these slip planes were activated during the Tohoku-Oki earthquake.
Rights: Copyright (2020) American Geophysical Union.
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 亀田 純

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