Abstract
Accompanied with the Guam earthquake on Aug. 8, 1993 (epicenter: 13.0°N, 144.7°E, d=61km, Ms=8.0, USGS), a tsunami was observed at many tidal stations in Japan. Tsunami magnitude and the behavior of propagation are investigated, comparing with those of the 1990 Saipan tsunami (m=2). The travel times in West Japan were about 3.5 hours. The maximum double amplitude at Muroto and Tosa-Shimizu near the tip of peninsula reached 84cm with the wave-period of 8 minutes, and those in the Ryukyu Islands were relatively small. The distribution pattan of wave-heights is similar to that of the 1990 Saipan tsunami. By judging from the diagram of the attenuation of wave-height with distance, the tsunami magnitude on the Imamura-Iida scale was determined to be m=2.5. Although wave-heights of the present tsunami are about 1.5 times higher than those of the 1990 Saipan tsunami, the magnitude value is normal compared to earthquake with similar size in other regions.
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Schedule a callMore From: Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
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