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

Earth and Planetary Science Letters

By:
, , , , and
DOI: 10.1016/j.epsl.2012.04.006

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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.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Sources of shaking and flooding during the Tohoku-Oki earthquake: a mixture of rupture styles
Series title:
Earth and Planetary Science Letters
DOI:
10.1016/j.epsl.2012.04.006
Volume
333-334
Year Published:
2012
Language:
English
Publisher:
Elsevier
Publisher location:
Amsterdam, Netherlands
Contributing office(s):
Earthquake Science Center
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Earth and Planetary Science Letters
First page:
91
Last page:
100
Country:
Japan