Sources of shaking and flooding during the Tohoku-Oki earthquake: a mixture of rupture styles
Earth and Planetary Science Letters
By: Shengji Wei, Robert Graves, Don Helmberger, Jean-Philippe Avouac, and Junle Jiang
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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.
Suggested Citation
Wei, S., Graves, R., Helmberger, D., Avouac, J., Jiang, J., 2012, Sources of shaking and flooding during the Tohoku-Oki earthquake: a mixture of rupture styles: Earth and Planetary Science Letters, v. 333-334, p. 91-100, https://doi.org/10.1016/j.epsl.2012.04.006.
Study Area
| 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 |