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Sources of shaking and flooding during the Tohoku-Oki earthquake: A mixture of rupture styles

Wei, Shengji and Graves, Robert and Helmberger, Don and Avouac, Jean-Philippe and Jiang, Junle (2012) Sources of shaking and flooding during the Tohoku-Oki earthquake: A mixture of rupture styles. Earth and Planetary Science Letters, 333-334 . pp. 91-100. ISSN 0012-821X. https://resolver.caltech.edu/CaltechAUTHORS:20120827-114719257

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Abstract

Modeling strong ground motions from great subduction zone earthquakes is one of the great challenges of computational seismology. To separate the rupture characteristics from complexities caused by 3D sub-surface geology requires an extraordinary data set such as provided by the recent Mw9.0 Tohoku-Oki earthquake. Here we combine deterministic inversion and dynamically guided forward simulation methods to model over one thousand high-rate GPS and strong motion observations from 0 to 0.25 Hz across the entire Honshu Island. Our results display distinct styles of rupture with a deeper generic interplate event (∼Mw8.5) transitioning to a shallow tsunamigenic earthquake (∼Mw9.0) at about 25 km depth in a process driven by a strong dynamic weakening mechanism, possibly thermal pressurization. This source model predicts many important features of the broad set of seismic, geodetic and seafloor observations providing a major advance in our understanding of such great natural hazards.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.epsl.2012.04.006DOIArticle
http://www.sciencedirect.com/science/article/pii/S0012821X12001732PublisherArticle
ORCID:
AuthorORCID
Avouac, Jean-Philippe0000-0002-3060-8442
Jiang, Junle0000-0002-8796-5846
Additional Information:© 2012 Elsevier B.V. Accepted 6 April 2012. Editor: P. Shearer. This research was supported by NSF Grant EAR-1142020 and USGS Award G10AP00048. Shengji Wei is supported in part under USGS Cooperative Agreement G09AC00150. Some of the large-scale 3D finite difference simulations were run at the University of Southern California’s Center for High Performance Computing and Communications(http://www.usc.edu/hpcc) under an agreement with the SCEC Community Modeling Environment project. The high-rate GPS data, generously made available by C Rocken of GPS Solutions, Inc. originated with efforts by GSI, NGDS, Hitz, GPSS and VERIPOS. Processed GPS time series are provided through the Caltech ARIA project. Strong motion waveforms were obtained from K-Net and KiK-Net of NIED. The Generic Mapping Tools (GMT) were used for creating the figures. We thank Morgan Page and Kenneth Hudnut for their comments.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-1142020
USGSG10AP00048
USGSG09AC00150
Subject Keywords:Tohoku-Oki earthquake; finite fault; strong motion; tsunami; high-rate GPS
Record Number:CaltechAUTHORS:20120827-114719257
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120827-114719257
Official Citation:Shengji Wei, Robert Graves, Don Helmberger, Jean-Philippe Avouac, Junle Jiang, Sources of shaking and flooding during the Tohoku-Oki earthquake: A mixture of rupture styles, Earth and Planetary Science Letters, Volumes 333–334, 1 June 2012, Pages 91-100, ISSN 0012-821X, 10.1016/j.epsl.2012.04.006.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33564
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:27 Aug 2012 20:21
Last Modified:03 Oct 2019 04:11

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