Seismic tomography and anisotropy in the source area of the 2008 Iwate-Miyagi earthquake (M 7.2)

Details Seismic tomography and anisotropy in the source area of the 2008 Iwate-Miyagi earthquake (M 7.2) Seismic tomography and anisotropy in the source area of the 2008 Iwate-Miyagi earthquake (M 7.2)

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011pepi..184..172c&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 184, Issue 3-4, p. 172-185.

Physics

6

Scientific paper

In order to understand the generation mechanism of the Iwate-Miyagi earthquake (M 7.2) that occurred on 14 June 2008 in Northeast Japan, we determined high-resolution 3D seismic velocity (Vp, Vs) and Poisson's ratio (σ) structures as well as P-wave azimuthal anisotropy in and around the source area using 246,623 P-wave and 189,153 S-wave high-quality arrival times from 1941 aftershocks of the 2008 Iwate-Miyagi earthquake as well as 4878 shallow and intermediate-depth earthquakes in this area recorded by the dense High-Sensitivity Seismic Network (Hi-net) and the seismic stations of Tohoku University. Our results show that hypocenters of the mainshock and three large aftershocks are located in a boundary zone where both seismic velocity and Poisson's ratio change drastically in a short distance. A zone with pronounced low-velocity and high Poisson's ratio is revealed in the lower crust and uppermost mantle under the source area, which may reflect the arc magma and fluids ascending from the upper-mantle wedge. The P-wave azimuthal anisotropy is complex under the study area, which may also indicate the complex crustal structure there. These results indicate that the generation of the 2008 Iwate-Miyagi earthquake was influenced by the ascending arc magma and fluids associated with the dehydration reactions of the subducting Pacific slab under Northeast Japan.

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