駿河湾周辺地域における<i>V<sub>p</sub></i>/<i>V<sub>s</sub></i>の時間的変化

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書誌事項

タイトル別名
  • A Search for Temporal Variations in <i>V<sub>p</sub></i>/<i>V<sub>s</sub></i> around Suruga Bay
  • 駿河湾周辺地域におけるVp/Vsの時間的変化
  • スルガワン シュウヘン チイキ ニ オケル Vp Vs ノ ジカンテキ ヘンカ

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抄録

The suggestion was tested that anomalously low velocity of compressional waves around Suruga Bay at the northeast end of Nankai trough might be a precursor for an impending great Tokai earthquake. Temporal variations in the ratio of compressional to shear velocities in the region were analyzed during the period from January 1951 to June 1976 by using the events which have frequently occurred in the eastern part of the Kanto district.<br>Long term premonitory variations in Vp/Vs ratios relating with a forthcoming large earthquake with magnitude about 8.0 could not be detected. On the other hand, a significant decrease of about 15% in Vp/Vs was observed over a 5-year period preceding the 1965 Shizuoka earthquake (M6.1, H=20km). This anomaly, time seems to be unusually longer for its magnitude.<br>The circumstances might be well explained a new model which takes the thermal process into consideration for earthquake forerunners.

収録刊行物

  • 地震　第２輯

    地震　第２輯 30 (3), 307-316, 1977

    公益社団法人 日本地震学会

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