南関東で発生したM 7級地震に対する既往研究とデータの収集 -1921年茨城県南部の地震,1922年浦賀水道付近の地震および1987年千葉県東方沖地震-

概要

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The Earthquake Research Committee of the Headquarters of Earthquake Research and Promotion estimated the probability of an earthquake of magnitude around 7.0 occurring during the next 30 years as 70%. This is based on five earthquakes that occurred in the southern Kanto region (i.e., the 1894 Meiji-Tokyo earthquake, the 1895 and 1921 Ibaraki-ken Nanbu earthquakes, the 1922 Uraga-channel earthquake and the 1987 Chiba-ken Toho-Oki earthquake). However, it has been revealed that the Kanto region is situated on complicated tectonic conditions due to subduction of the Philippine Sea Plate and the Pacific Plate beneath the continental plate, and that various types of earthquake occur. Therefore, it is necessary to classify these earthquakes into interplate and slab earthquakes, and to estimate recurrence intervals. In this paper, at the outset of such studies, we review previous studies on three earthquakes (the 1921 Ibaraki-ken Nanbu earthquake, the 1922 Uraga-channel earthquake and the 1987 Chiba-ken Toho-Oki earthquake) that occurred after the beginning of the Taisho era (1912−1926) and describe the collected data.
2010-01-28