The ratios of the spectral amplitude at 10cps to that at 20cps of the compressional waves obtained from the explosions in the Matsushiro earthquake swarm area are used to study the latera1 variation of specific attenuation factor Q in this area. The head waves through the 6 km/sec-1ayer observed at the observation sites on Profiles A and B are analyzed for this purpose. This analysis showed that the location of the low Q region coincided with the seismically most active region, and the Q value in this region was extremely low, 30 to 50, which is 1/20 to 1/50 of the surrounding region.
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Sadaomi Suzuki (1972) studied this question.
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