日本海中部地震域における全磁力磁気異常の大気球往復観測実験結果

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タイトル別名
  • ニホンカイ チュウブ ジシンイキ ニ オケル ゼン ジリョク ジキ イジョウ
  • Results of Geomagnetic Survey with Boomerang Balloons around the Earthquake Area of the Central Japan Sea

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Measurements of geomagnetic field anomalies are applied to investigate the underground magnetic structure. It's very useful to detect the geomagnetic total intensity by means of proton precession magnetometers that carried by balloons at the altitude of 15-30km. Twice balloon observations in 1981 and in 1985 with high sensitive magnetometers were carried out at the area of the Central Japan Sea Earthquake which occured in May, 1983. An underground dislocation model was calculated using the Talwani Method and it was explained that the magnetization of structural magnetic metals had changed between at before and after the Earthquake. That is to say, the value of magentization had increased from 1.2 times to 2.5 times at the just before of the Earthquake compared with the value at the after. And a tendency was verified that structural magnetic models were aligned toward to Japan Arc and had a east slope.

資料番号: SA0166825000

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