地震とラドン濃度異常（ＩＩ）―兵庫県南部地震前に観測された大気中ラドン濃度異常―

DOI Web Site 被引用文献3件 参考文献68件

書誌事項

タイトル別名
  • Radon Anomalies Prior to Earthquakes (II)-Atmospheric Radon Anomaly Observed before the Hyogoken-Nanbu Earthquake-
  • ジシン ト ラドン ノウド イジョウ 2 ヒョウゴケン ナンブ ジシンマエ ニ カンソクサレタ タイキチュウ ラドン ノウド イジョウ
  • Atmospheric Radon Anomaly Observed before the Hyogoken-Nanbu Earthquake
  • 兵庫県南部地震前に観測された大気中ラドン濃度異常

この論文をさがす

抄録

Before the 1995 Hyogoken-Nanbu earthquake, various geochemical precursors were observed in the aftershock area: chloride ion concentration, groundwater discharge rate, groundwater radon concentration and so on. Kobe Pharmaceutical University (KPU) is located about 25km northeast from the epicenter and within the aftershock area. Atmospheric radon concentration had been continuously measured from 1984 at KPU, using a flow-type ionization chamber. The radon concentration data were analyzed using the smoothed residual values which represent the daily minimum of radon concentration with the exclusion of normalized seasonal variation. The radon concentration (smoothed residual values) demonstrated an upward trend about two months before the Hyogoken-Nanbu earthquake. The trend can be well fitted to a log-periodic model related to earthquake fault dynamics. As a result of model fitting, a critical point was calculated to be between 13 and 27 January 1995, which was in good agreement with the occurrence date of earthquake (17 January 1995). The mechanism of radon anomaly before earthquakes is not fully understood. However, it might be possible to detect atmospheric radon anomaly as a precursor before a large earthquake, if (1) the measurement is conducted near the earthquake fault, (2) the monitoring station is located on granite (radon-rich) areas, and (3) the measurement is conducted for more than several years before the earthquake to obtain background data.

収録刊行物

  • 保健物理

    保健物理 43 (3), 253-267, 2008

    日本保健物理学会

被引用文献 (3)*注記

もっと見る

参考文献 (68)*注記

もっと見る

関連プロジェクト

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ