著者
遠山 忠昭 檀原 毅 里村 幹夫
出版者
公益社団法人 日本地震学会
雑誌
地震 第2輯 (ISSN:00371114)
巻号頁・発行日
vol.37, no.4, pp.539-547, 1984-12-25 (Released:2010-03-11)
参考文献数
4
被引用文献数
1 1

Although γ-ray surveys have often been carried out in order to research active faults, clear correspondence of γ-ray intensity to faults has not always been obtained. We examined over again the methods of γ-ray surveys and the following two points came up as important problems.(a) The hole to set the senser of γ-ray survey meter must be bored in the same radius and depth at each survey point.(b) Much attention must be payed to the difference of surface materials.In order to confirm the usefulness of the method in which the above two points are taken into consideration, the γ-ray surveys were carried out along a line across the Himenoyu fault. This fault was formed at the time of North-Izu earthquake in 1930, and its traces are yet clearly found. A clear peak of γ-ray intensity was obtained at the position on the fault.Next, this method was applied to the Ono fault whose precise position has not yet known, and we estimated the position of the fault by the results of γ-ray surveys.

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ラドンは同位体がいくつかありますが、いずれも半減期が短い(数時間から数日)のが特徴です。また水に溶けやすいので、ラドンが地表に上がってきたものは地下水とともに上がってきたと考えられます。 そのため、ラドン濃度高い場所には断層があるとか、地震前には地下の岩石中に新たな割れ目ができ、そこを地下水が上がってくるのでラドン濃度が増加するとか言った説があります。地表でラドン濃度が上がった場合、新たな水 ...

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