Annual variation in the atmospheric radon concentration in Japan

2015 ◽  
Vol 146 ◽  
pp. 110-118 ◽  
Author(s):  
Yuka Kobayashi ◽  
Yumi Yasuoka ◽  
Yasutaka Omori ◽  
Hiroyuki Nagahama ◽  
Tetsuya Sanada ◽  
...  
Keyword(s):  
Radon Concentration ◽  
Annual Variation ◽  
Atmospheric Radon

Evidence of precursor phenomena in the Kobe earthquake obtained from atmospheric radon concentration

2006 ◽  
Vol 21 (6) ◽  
pp. 1064-1072 ◽  
Author(s):  
Yumi Yasuoka ◽  
George Igarashi ◽  
Testuo Ishikawa ◽  
Shinji Tokonami ◽  
Masaki Shinogi
Keyword(s):  
Radon Concentration ◽  
Kobe Earthquake ◽  
Atmospheric Radon

scholarly journals Non-parametric detection of atmospheric radon concentration anomalies related to earthquakes

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Daichi Iwata ◽  
Hiroyuki Nagahama ◽  
Jun Muto ◽  
Yumi Yasuoka
Keyword(s):  
Radon Concentration ◽  
Atmospheric Radon ◽  
Non Parametric

scholarly journals Anomalous radon emanation linked to preseismic electromagnetic phenomena

2007 ◽  
Vol 7 (5) ◽  
pp. 629-635 ◽  
Author(s):  
Y. Omori ◽  
Y. Yasuoka ◽  
H. Nagahama ◽  
Y. Kawada ◽  
T. Ishikawa ◽  
...  
Keyword(s):  
Electric Field ◽  
Power Law ◽  
Radon Concentration ◽  
Damage Evolution ◽  
Atmospheric Electric Field ◽  
Ionospheric Disturbances ◽  
Radon Emanation ◽  
Radon Anomaly ◽  
Large Earthquakes ◽  
Atmospheric Radon

Abstract. Anomalous emanation of radon (222Rn) was observed preceding large earthquakes and is considered to be linked to preseismic electromagnetic phenomena (e.g. great changes of atmospheric electric field and ionospheric disturbances). Here we analyze atmospheric radon concentration and estimate changes of electrical conditions in atmosphere due to preseismic radon anomaly. The increase of radon emanation obeys crustal damage evolution, following a power-law of time-to-earthquake. Moreover, the radon emanation decreases the atmospheric electric field by 40%, besides influencing the maximum strength of atmospheric electric field by 104–105 V/m enough to trigger ionospheric disturbances. These changes are within the ranges observed or explaining electromagnetic phenomena associated with large earthquakes.

Preseismic changes in atmospheric radon concentration and crustal strain

2009 ◽  
Vol 34 (6-7) ◽  
pp. 431-434 ◽  
Author(s):  
Yumi Yasuoka ◽  
Yusuke Kawada ◽  
Hiroyuki Nagahama ◽  
Yasutaka Omori ◽  
Tetsuo Ishikawa ◽  
...  
Keyword(s):  
Radon Concentration ◽  
Crustal Strain ◽  
Atmospheric Radon

Normal seasonal variations for atmospheric radon concentration: a sinusoidal model

2015 ◽  
Vol 139 ◽  
pp. 149-153 ◽  
Author(s):  
Koseki Hayashi ◽  
Yumi Yasuoka ◽  
Hiroyuki Nagahama ◽  
Jun Muto ◽  
Tetsuo Ishikawa ◽  
...  
Keyword(s):  
Seasonal Variations ◽  
Radon Concentration ◽  
Sinusoidal Model ◽  
Atmospheric Radon

scholarly journals Seasonal variation of radon and CO2 in the Važecká Cave, Slovakia

Nukleonika ◽  
2020 ◽  
Vol 65 (2) ◽  
pp. 153-157
Author(s):  
Iveta Smetanová ◽  
Karol Holý ◽  
Ľubica Luhová ◽  
Kristian Csicsay ◽  
Dagmar Haviarová ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Relative Humidity ◽  
Air Temperature ◽  
Radon Concentration ◽  
Continuous Monitoring ◽  
Annual Variation ◽  
Activity Concentration ◽  
Atmospheric Temperature ◽  
Annual Maximum ◽  
The Difference

AbstractThe continuous monitoring of 222Rn activity concentration, CO2 concentration, and microclimatologic parameters (internal air temperature and relative humidity) in the Važecká Cave (Northern Slovakia) is being carried out at three monitoring stations, namely, Gallery, Lake Hall, and Entrance Hall. Radon activity concentration and CO2 concentration exhibited a clear annual variation. The daily average of radon concentration ranged 1300–27 700 Bq/m3 at the Lake Hall station and 3600–42 200 Bq/m3 at the Gallery station. Radon reached its maximum in the summer months, from June to September. The annual maximum of CO2 concentration is registered approximately one month later than radon maximum. The annual variation of radon and CO2 is controlled by the seasonal change of ventilation regime associated with the seasonal variation of the difference between the temperature measured inside the cave and the atmospheric temperature.

scholarly journals Time-scale invariant changes in atmospheric radon concentration and crustal strain prior to a large earthquake

2007 ◽  
Vol 14 (2) ◽  
pp. 123-130 ◽  
Author(s):  
Y. Kawada ◽  
H. Nagahama ◽  
Y. Omori ◽  
Y. Yasuoka ◽  
T. Ishikawa ◽  
...  
Keyword(s):  
Power Law ◽  
Time Scale ◽  
Radon Concentration ◽  
Large Earthquake ◽  
Irreversible Thermodynamic ◽  
Time To Failure ◽  
Scale Invariant ◽  
Crustal Strain ◽  
Kobe Earthquake ◽  
Atmospheric Radon

Abstract. Prior to large earthquakes (e.g. 1995 Kobe earthquake, Japan), an increase in the atmospheric radon concentration is observed, and this increase in the rate follows a power-law of the time-to-earthquake (time-to-failure). This phenomenon corresponds to the increase in the radon migration in crust and the exhalation into atmosphere. An irreversible thermodynamic model including time-scale invariance clarifies that the increases in the pressure of the advecting radon and permeability (hydraulic conductivity) in the crustal rocks are caused by the temporal changes in the power-law of the crustal strain (or cumulative Benioff strain), which is associated with damage evolution such as microcracking or changing porosity. As the result, the radon flux and the atmospheric radon concentration can show a temporal power-law increase. The concentration of atmospheric radon can be used as a proxy for the seismic precursory processes associated with crustal dynamics.

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