1973年6月17日の「根室半島沖地震」に対する帯広およびその周辺でのアンケート調査

概要

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On June 17, 1973, a big earthquake named "The Earthquake off the Nemuro Peninsula" occurred near the southeastern coast of Hokkaido. The magnitude of the earthquake was reported as 7.4 by Japan Meteorological Agency. The damage by the earthquake was remarkable in the eastern part of Hokkaido. As soon as the earthquake occurred, about 5000 questionnaires were delivered to Nemuro, Kushiro, Obihiro, Hiroo and Urakawa areas. The objects of the questionnaire survey were to estimate the seismic intensity and to make seismic microzoning maps at every area with the procedure of a series of calculations by an electronic computer. About 1500 questionnaires in Obihiro and its surroundings were analyzed. The seismic intensity of Obihiro area was determined as 3.10 relatively. The relative intensity 3.10 was equivalent to about IV of the J.M.A. 's intensity scale by using the other investigations. The seismic microzoning map was shown by contour lines of equi-intensity. The mean intensity was adopted as the standard intensity in the contour map. As a result of analyses, two seismic microzoning maps were obtained. One was of the city area of Obihiro, and the other was of Tokachi district including Obihiro and its surroundings. On the other hand, when "The off Tokachi Earthquake in 1968", the investigation of the distribution of seismic intensities had carried out in all Hokkaido by members of Department of Geophysics, Hokkaido University. In this paper, the data of the survey in 1968, in which the survey points of Obihiro area were about 300, were analyzed by a similar procedure again. Two seismic microzoning maps in 1968 were obtained, too. The maps in 1973 and in 1968 were compared with each other and discussed with geological data. It was concluded that the seismic microzoning maps of each earthquake were very similar on the whole.
帯広畜産大学の論文
1975-06-10

著者

小柳敏郎
帯広畜産大学

1973年6月17日の「根室半島沖地震」に対する帯広およびその周辺でのアンケート調査

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