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dc.contributor.authorTappin, David R.
dc.contributor.authorGrilli, Stephan T.
dc.contributor.authorHarris, Jeffrey C.
dc.contributor.authorGeller, Robert J.
dc.contributor.authorMasterlark, Timothy
dc.contributor.authorKirby, James T.
dc.contributor.authorShi, Fengyan
dc.contributor.authorMa, Gangfeng
dc.contributor.authorThingbaijam, Kiran Kumar
dc.contributor.authorMai, Paul Martin
dc.date.accessioned2015-05-06T13:27:03Z
dc.date.available2015-05-06T13:27:03Z
dc.date.issued2014-09-28
dc.identifier.citationDid a submarine landslide contribute to the 2011 Tohoku tsunami? 2014, 357:344 Marine Geology
dc.identifier.issn00253227
dc.identifier.doi10.1016/j.margeo.2014.09.043
dc.identifier.urihttp://hdl.handle.net/10754/552381
dc.description.abstractMany studies have modeled the Tohoku tsunami of March 11, 2011 as being due entirely to slip on an earthquake fault, but the following discrepancies suggest that further research is warranted. (1) Published models of tsunami propagation and coastal impact underpredict the observed runup heights of up to 40 m measured along the coast of the Sanriku district in the northeast part of Honshu Island. (2) Published models cannot reproduce the timing and high-frequency content of tsunami waves recorded at three nearshore buoys off Sanriku, nor the timing and dispersion properties of the waveforms at offshore DART buoy #21418. (3) The rupture centroids obtained by tsunami inversions are biased about 60 km NNE of that obtained by the Global CMT Project. Based on an analysis of seismic and geodetic data, together with recorded tsunami waveforms, we propose that, while the primary source of the tsunami was the vertical displacement of the seafloor due to the earthquake, an additional tsunami source is also required. We infer the location of the proposed additional source based on an analysis of the travel times of higher-frequency tsunami waves observed at nearshore buoys. We further propose that the most likely additional tsunami source was a submarine mass failure (SMF—i.e., a submarine landslide). A comparison of pre- and post-tsunami bathymetric surveys reveals tens of meters of vertical seafloor movement at the proposed SMF location, and a slope stability analysis confirms that the horizontal acceleration from the earthquake was sufficient to trigger an SMF. Forward modeling of the tsunami generated by a combination of the earthquake and the SMF reproduces the recorded on-, near- and offshore tsunami observations well, particularly the high-frequency component of the tsunami waves off Sanriku, which were not well simulated by previous models. The conclusion that a significant part of the 2011 Tohoku tsunami was generated by an SMF source has important implications for estimates of tsunami hazard in the Tohoku region as well as in other tectonically similar regions.
dc.publisherElsevier BV
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0025322714002898
dc.rightsArchived with thanks to Marine Geology. http://creativecommons.org/licenses/by/3.0/
dc.subjecttsunami
dc.subjectsubmarine mass failure
dc.subjectearthquake
dc.subjectTohoku
dc.subjectmodeling
dc.titleDid a submarine landslide contribute to the 2011 Tohoku tsunami?
dc.typeArticle
dc.contributor.departmentComputational Earthquake Seismology (CES) Research Group
dc.contributor.departmentEarth Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalMarine Geology
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionBritish Geological Survey, Keyworth, Nottingham, UK
dc.contributor.institutionDepartment of Ocean Engineering, University of Rhode Island, Narragansett, RI, USA
dc.contributor.institutionDepartment of Earth and Planetary Science, Graduate School of Science, University of Tokyo, Tokyo, Japan
dc.contributor.institutionDepartment of Geology and Geological Engineering, South Dakota School of Mines and Technology, Rapid City, SD, USA
dc.contributor.institutionCenter for Applied Coastal Research, University of Delaware, Newark, DE, USA
dc.contributor.institutionDepartment of Civil and Environmental Engineering, Old Dominion University, Norfolk, VA, USA
kaust.personThingbaijam, Kiran Kumar
kaust.personMai, Paul Martin
refterms.dateFOA2018-06-14T07:34:45Z
dc.date.published-online2014-09-28
dc.date.published-print2014-11


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