Stress State in the Largest Displacement Area of the 2011 Tohoku-Oki Earthquake

Lin, W., Conin, M., Moore, J. C., Chester, F. M., Nakamura, Y., Mori, J. J., Anderson, L., Brodsky, E. E., Eguchi, N., Cook, B., Jeppson, T., Wolfson-Schwehr, M., Sanada, Y., Saito, S., Kido, Y., Hirose, T., Behrmann, Jan H., Ikari, M., Ujiie, K., Rowe, C., Kirkpatrick, J., Bose, S., Regalla, C., Remitti, F., Toy, V., Fulton, P., Mishima, T., Yang, T., Sun, T., Ishikawa, T., Sample, J., Takai, K., Kameda, J., Toczko, S., Maeda, L., Kodaira, S., Hino, R. and Saffer, D. (2013) Stress State in the Largest Displacement Area of the 2011 Tohoku-Oki Earthquake Science, 339 (6120). pp. 687-690. DOI 10.1126/science.1229379.

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Abstract

The 2011 moment magnitude 9.0 Tohoku-Oki earthquake produced a maximum coseismic
slip of more than 50 meters near the Japan trench, which could result in a completely reduced
stress state in the region. We tested this hypothesis by determining the in situ stress state of
the frontal prism from boreholes drilled by the Integrated Ocean Drilling Program approximately
1 year after the earthquake and by inferring the pre-earthquake stress state. On the basis of
the horizontal stress orientations and magnitudes estimated from borehole breakouts and the
increase in coseismic displacement during propagation of the rupture to the trench axis, in situ
horizontal stress decreased during the earthquake. The stress change suggests an active slip
of the frontal plate interface, which is consistent with coseismic fault weakening and a nearly
total stress drop.

Document Type: Article
Keywords: Tohoku-Oki Earthquake, stress state
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R06
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
DOI etc.: 10.1126/science.1229379
ISSN: 0036-8075
Projects: IODP, Future Ocean
Expeditions/Models:
Date Deposited: 31 Oct 2013 14:01
Last Modified: 05 Apr 2017 11:59
URI: http://eprints.uni-kiel.de/id/eprint/22314

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