Reexamination of the A.D. 869 Jogan earthquake size from tsunami deposit distribution, simulated flow depth, and velocity

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Title:	Reexamination of the A.D. 869 Jogan earthquake size from tsunami deposit distribution, simulated flow depth, and velocity
Authors:	佐竹健治;Namegaya, Yuichi;Satake, Kenji
Contributors:	地球科學學院地球科學學系
Keywords:	2011 Tohoku earthquake;AD 869 Jogan earthquake;Computer simulation;Deposition;Deposits;Earthquakes;fault model;Inundation;Mathematical models;Sand;Seismic activity;Seismic phenomena;tsunami deposit;tsunami flow depth;tsunami flow velocity;Tsunamis
Date:	2014-04-16
Issue Date:	2026-04-23 11:42:13 (UTC+8)
Publisher:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
Abstract:	摘要： The rupture parameters and magnitude of the A.D. 869 Jogan earthquake, a predecessor of the 2011 Tohoku earthquake, were previously estimated by matching tsunami deposit distributions with simulated inundation areas. The tsunami inundation associated with the 2011 Tohoku earthquake, however, extended farther inland than the sandy tsunami deposits. Numerical simulation of the 2011 tsunami indicated that flow depths and velocities were approximately 1 m and 0.6 m/s, respectively, at the most inland sand deposit sites on the Ishinomaki and Sendai plains. While these values depend on the assumed bottom roughness, we used these values to compare tsunami deposits and inundation simulation of the 869 Jogan earthquake from both uniform-slip and 2011-type variable-slip fault models. The results showed that the rupture length of the 869 Jogan earthquake was at least 200 km and its minimum moment magnitude was 8.6. 其他題名： Geophys. Res. Lett 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2014-04-16 出處： Geophysical Research Letters, 2014-04, Vol.41 (7), p.2297-2303 資源來源： Wiley Online Library - AutoHoldings Journals 版權： 2014. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 0094-8276 識別號： EISSN: 1944-8007 識別號： DOI: 10.1002/2013GL058678
Appears in Collections:	[Department of Earth Sciences ] journal & Dissertation

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