Anomalous changes in atmospheric radon concentration before and after the 2011 northern Wakayama earthquake (Mj 5.5)

Mikako Goto, Yumi Yasuoka, Hiroyuki Nagahama, Jun Muto, Yasutaka Omori, Hayato Ihara, Takahiro Mukai

研究成果: Article

3 引用 (Scopus)

抜粋

A significant increase in atmospheric radon concentration was observed in the area around the epicentre before and after the occurrence of the shallow inland earthquake in the northern Wakayama Prefecture on 5 July 2011 (Mj 5.5, depth 7 km) in Japan. The seismic activity in the sampling site was evaluated to identify that this earthquake was the largest near the sampling site during the observation period. To determine whether this was an anomalous change, the atmospheric daily minimum radon concentration measured for a 13-year period was analysed. When the residual radon concentration values without the seasonal radon variation and the linear trend was > 3 standard deviations of the residual radon variation corresponding to the normal period, the values were deemed as anomalous. As a result, an anomalous increase in radon concentration was determined before and after the earthquake. In conclusion, anomalous change related to earthquakes with at least Mj 5.5 can be detected by monitoring atmospheric radon near the epicentre.

元の言語English
記事番号ncw220
ページ(範囲)376-381
ページ数6
ジャーナルRadiation protection dosimetry
174
発行部数3
出版物ステータスPublished - 2017

ASJC Scopus subject areas

  • Radiation
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Public Health, Environmental and Occupational Health

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