38.関東地方に於ける雪原の垂直分布

概要

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The space distribution of the hypocentres of earthquakes that occurred in the Kwanto District within the last 12 years was statistically investigated. As is well known, the epicentres of earthquakes in this district are most closely distributed in two regions, namely, the northern part of Tokyo Bay and the region along the rivers Kinugawa and Tonegawa. Generally speaking, earthquakes are most frequent from depth of from 70 to 80km in the former region, and from depth of from 40 to 50km in the latter region, as already pointed out by Dr. T. Kodaira. The writer found however that, in the last 5 years (1931～1935), there were hardly any hypocentres beneath 60km in the former region, whereas in the preceding 7 years (1924～1930) they were most frequent from depth of from 70 to 80km in the same region. This fact may be regarded as showing that the instability caused in the lower part of the earth's crust as the result of the Kwanto Earthquake of 1923 is gradually diminishing.
東京帝国大学地震研究所,Earthquake Research Institute, Tokyo Imperial University,地震研究所の論文
1936-09-21