A temporary seismometer-array station such as described by Miyamura et al. (1961) was established at Tochimoto and at Tsukuba to investigate the micro-earthquakes occurring in the Kanto and Chubu region. The principal purposes of the present investigation are 1) to find the accuracy of hypocentre determination by the seismometer-array method, 2) to locate the zones of micro-earthquakes in the Kanto and Chubu region and 3) to learn something about the structure of the crust and upper mantle in this region. The epicentres determined independently by the Tsukuba station and by the Tochimoto station are shown in Fig. 9a and Fig. 9b respectively. It is remarkable that many earthquakes in the Western Kanto and Chubu region occur in the crust, while those in East Kanto occur mostly in the upper mantle. Fig. 10 shows the epicentres of 14 shocks for which both stations could give good determinations of them. There is a systematic divergence between the epicentres determined independently at the two stations. This divergence may be explained if the velocity in the upper mantle increases seaward.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
40
号
4
ページ
885 - 897
発行年
1963-03-10
ISSN
00408972
書誌レコードID
AN00162258
フォーマット
application/pdf
日本十進分類法
453
出版者
東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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筑波,栃本において同時のおこなつた多点式観測法による関東および中部地方の微小地震の研究
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