1973年根室半島沖津波の波源域と1894年津波との比較

概要

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Based on tide gauge records, the tsunamis accompanying the main shock (M=7.4) on June 17 and the largest aftershock (M=7.1) on June 24, 1973 off the Nemuro peninsula are investigated. The magnitudes of two tsunamis are m=1.5 and 0.5 respectively. The sea bottom of the tsunami source may be uplifted, judging from the initial motion of the tsunamis observed in the upward direction at the Hokkaido and Sanriku coasts. The source dimension is 130km long parallel to the Nemuro peninsula and the area is 7.2×103km2. The estimated source area of tsunami agrees well with the aftershock area and that of the second tsunami lies in the east side of the main source.