和歌山県由良における地殻変動の連続観測

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タイトル別名
  • Continuous Observations of the Crustal Deformation at Yura, Wakayama Prefecture
  • ワカヤマケン ユラ ニ オケル チカク ヘンドウ ノ レンゾク カンソク

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説明

Secular changes of the ground tilts and strains observed at Yura, Wakayama Prefecture, since the beginning of observations in 1951 are reviewed. Anomalous tilts which have been considered to be related with two large earthquakes, the 1952 Yoshino and 1960 Odaigahara earthquakes, are especially conspicuous in the whole period of the observations. However, there still remains a possibility that these changes might contain instrumental drift to some degree. A change of the mode of the tilts and strains is seen in the period from 1973 to 1974, which might be caused either by the occurrence of two remarkable earthquakes (M=5.9 and 5.8) about 25 km east of Yura, or coincident with an anomalous crustal deformation over a wide area observed at several other stations in Japan.

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