A Statistical Analysis of the Relationship between Days of Earthquake in Japan and Its Vicinity and Beryllium-7 Concentrations in the Surface Air at Takasaki
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- ICHIHASHI Masaki
- Nuclear Nonproliferation Science and Technology Center, Japan Atomic Energy Agency
Bibliographic Information
- Other Title
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- 日本付近の地震発生日と高崎の大気中ベリリウム‐7濃度の関係に係る統計分析
- 日本付近の地震発生日と高崎の大気中ベリリウム-7濃度の関係に係る統計分析
- ニホン フキン ノ ジシン ハッセイビ ト タカサキ ノ タイキ チュウ ベリリウム-7 ノウド ノ カンケイ ニ カカル トウケイ ブンセキ
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Description
The relationship between the days of earthquake in Japan and its vicinity and the Be-7 concentrations in the surface air at Takasaki were statistically analyzed. A day when one or more earthquakes of M 5 or greater occurred in Japan and its vicinity was defined as a “day of earthquake”. Earthquakes which were deemed aftershocks were not included in the analysis. In order to avoid the effect of seasonal variation, the residuals obtained by deducting 31-day moving averages from Be-7 concentrations and those obtained by deducting the ‘21-day’ moving averages of the periods from −15 to +0 days and from +11 to +15 days were analyzed. The ‘21-day’ moving averages were also calculated to avoid the effect of aftershocks. Rank-sum tests of the residuals showed that the Be-7 concentrations decreased from the 31-day and ‘21-day’ moving averages on days of earthquake. A binomial test showed that there were significantly more days of earthquake when the Be-7 concentrations were smaller than the medians of Be-7 concentrations for the 31-day periods (from 15 days before to 15 days after days of earthquake) than those when the Be-7 concentrations exceeded the medians. These suggest that the Be-7 concentrations decrease on days of earthquake. It is noted that the Be-7 concentrations on days of earthquake decreased on days of both precipitation and non-precipitation, respectively.
Journal
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- Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
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Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 64 (1), 23-32, 2011
SEISMOLOGICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390001204304687360
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- NII Article ID
- 10029579368
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- NII Book ID
- AN00305741
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- ISSN
- 18839029
- 2186599X
- 00371114
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- NDL BIB ID
- 024341916
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed