Principal horizontal stress orientations prior to the 2011 Mw 9.0 Tohoku-Oki, Japan, earthquake in its source area

Details Principal horizontal stress orientations prior to the 2011 Mw 9.0 Tohoku-Oki, Japan, earthquake in its source area Principal horizontal stress orientations prior to the 2011 Mw 9.0 Tohoku-Oki, Japan, earthquake in its source area

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3800g10l&link_type=abstract

Geophysical Research Letters, Volume 38, CiteID L00G10

Physics

Geophysics

Exploration Geophysics: Downhole Methods, Seismology: Subduction Zones (1207, 1219, 1240), Tectonophysics: Stresses: Crust And Lithosphere, Tectonophysics: Stresses: General, Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413)

Scientific paper

We determined principal horizontal stress orientations as of 1999 at sites in the source area of the 2011 Mw 9.0 Tohoku-Oki earthquake, on the deep-sea terrace of the Japan Trench. The maximum principal horizontal stress orientation at site 1151 of Ocean Drilling Program Leg 186, located in an aseismic zone, was east-southeast, parallel with the plate convergence direction; and the stress orientation at site 1150 of Leg 186, in a seismically active zone, was south-southeast, suggestive of a local stress feature due to the influence of seismic activity. Aftershocks with normal faulting mechanisms, observed in the hanging wall of the plate interface that ruptured during the Tohoku-Oki earthquake, indicate a normal faulting postseismic stress regime, which clearly differs from the stress state prior to the earthquake. Consequently, the stress state may have changed from a reverse to a normal faulting stress regime during the Tohoku-Oki earthquake sequence.

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