Abstract
Distribution of intermediate and deep earthquake hypocenters beneath the Hokkaido corner, one of the notable arc-junctions in Japan, is investigated. A specially designed projection of the hypocenters is made to demonstrate the configuration of the seismic zone beneath the arc-junction. The configuration is characterized by a peculiar folding in the depth range between 80 and 150km, which seems to be caused by plastic deformation of the descending lithosphere.Attenuation of seismic waves of local earthquakes is also studied. Q values for S waves fall in the range between 50 and 200 in the upper mantle beneath Hokkaido. The distribution of Q values shows that the high attenuation zones correspond to the areas of high heat flow.
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