堂平微小地震観測網による1974年伊豆半島沖地震の余震観測

概要

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1974年伊豆半島沖地震調査概報An earthquake of the magnitude 6.9 occurred off the Izu Peninsula on May 9, 1974. Two foreshocks and many aftershocks were recorded at the Dodaira Micro-earthquake Observatory Network from the beginning of the main shock. The epicenters of the aftershocks were distributed mainly in the fault zone along the southwestern coast of the Peninsula and the Amagiregion, The daily frequency of aftershocks for a period of 30 days from the main shock is well represented by the formula, n(t)=k・t-p, with p=0.94.