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We estimated precise 3-D attenuation structure beneath the Tohoku district, Japan, by inversion using a large number of strong motion records. Study area is 138-144•‹ E in longitude and 36-42•‹ N in latitude. Block size of inversion is horizontally 0.2•‹ and 30 km in depth. Number of data is 21,578. These data were observed by the K-NET, the KiK-net and the JMA95-type seismometers. The result of checkerboard test shows good resolution at inland area in the depth range of 0-30 km and 30-60 km. The inversion results at 5 Hz and 10 Hz show clear relation between Low-Q zones and active volcanoes. Low-Q zones in the depth of 0-30 km clearly correspond to Quaternary active volcanoes and the significant Low-Q belt was obtained along the volcanic front at 30-60 km.

Three Dimensional Attenuation Structure beneath the Tohoku District by using Seismic Strong Motion Records