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.

	Text Lin_et_al_Science_2013.pdf - Published Version Restricted to Registered users only Download (2MB) | Contact
	Text 1229379.Lin.SM.pdf - Supplemental Material Restricted to Registered users only Download (2MB) | Contact

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.

Actions (login required)

View Item