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Source rupture models for the M (sub w) 9.0 2011 Tohoku earthquake from joint inversions of high-rate geodetic and seismic data

Han Yue and Thorne Lay
Source rupture models for the M (sub w) 9.0 2011 Tohoku earthquake from joint inversions of high-rate geodetic and seismic data (in 2011 Tohoku earthquake and tsunami, Thorne Lay (editor), Yushiro Fujii (editor), E. Geist (editor), K. Koketsu (editor), J. Rubinstein (editor), T. Sagiya (editor) and M. Simons (editor))
Bulletin of the Seismological Society of America (May 2013) 103 (2B): 1242-1255

Abstract

The space-time history of fault slip during the 11 March 2011 Tohoku earthquake (M (sub w) 9.0) is determined using high sample rate three-component Global Positioning System (GPS) recordings from regional stations across Japan, teleseismic broadband P waves, global R (sub 1) source time functions determined by empirical Green's function deconvolutions of short-arc Rayleigh waves, and ocean-bottom deformation observations. Least-squares inversions are performed for models with prescribed rupture-front expansion velocity. Joint inversion yields improved resolution of slip compared with inversions using any single data type for both checkerboard rupture simulations and the actual data. Joint inversion stabilizes inversions with respect to some key parameters, such as the rupture expansion velocity and subfault total rupture durations, due to lower dependence on these parameters of some datasets (mainly the high sample rate [1 sample/s] three-component GPS recordings [hr-GPS] data). The preferred joint inversion model has a seismic moment estimate of 4.2X10 (super 22) N.m (M (sub w) 9.0), with a primary large-slip patch with maximum slip of approximately 50-60 m located up-dip of the hypocenter on the shallow megathrust and distributed slip of 20-30 m near the hypocenter. A down-dip low-slip extension to the south is also resolved, with centroid source time later than 110 s.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 103
Serial Issue: 2B
Title: Source rupture models for the M (sub w) 9.0 2011 Tohoku earthquake from joint inversions of high-rate geodetic and seismic data
Title: 2011 Tohoku earthquake and tsunami
Author(s): Yue, HanLay, Thorne
Author(s): Lay, Thorneeditor
Author(s): Fujii, Yushiroeditor
Author(s): Geist, E.editor
Author(s): Koketsu, K.editor
Author(s): Rubinstein, J.editor
Author(s): Sagiya, T.editor
Author(s): Simons, M.editor
Affiliation: University of California at Santa Cruz, Department of Earth and Planetary Sciences, Santa Cruz, CA, United States
Affiliation: University of California at Santa Cruz, Department of Earth and Planetary Sciences, Santa Cruz, CA, United States
Pages: 1242-1255
Published: 201305
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 60
Accession Number: 2013-044415
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Supplemental information/data is available in the online version of this article
Illustration Description: illus. incl. geol. sketch maps
N30°00'00" - N45°00'00", E129°00'00" - E147°00'00"
Secondary Affiliation: International Institute of Seismology, JPN, JapanU. S. Geological Survey, USA, United StatesEarthquake Research Institute, JPN, JapanDisaster Mitigation Research Center, JPN, JapanCalifornia Institute of Technology, USA, United States
Source Note: Supplement
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201328
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