Abstract
SUMMARY Previous studies have suggested a low-Q anomaly beneath the Hida Mountain Range (the Japan Alps). However, data have been too sparse to determine propagating characteristics of seismic waves beneath the Japan Alps, or to argue strongly for the existence of the 1ow-Q anomaly. In order to study the low-Q anomaly in detail, 11 portable seismograph systems were deployed on a line across the northern part of the Japan Alps, Central Honshu, Japan, from July 26 to October 17 in 1989. The seismographs record ground-velocity amplitude. After corrections €or the focal mechanisms and site effects by an empirical method, the normalized rms amplitude of P-wave coda was used to study effects of attenuations. It becomes clear in the present study that:
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