Radon anomaly in soil gas as an earthquake precursor

Miklavčić, Igor; Radolić, Vanja; Vuković, Branko; Poje, Marina; Varga, Maja; Stanić, Denis; Planinić, Josip

doi:10.1016/j.apradiso.2008.03.002

Cited by 26 publications

(8 citation statements)

References 8 publications

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“…The rise in soil radon concentration prior to an earthquake may be due to the strain buildup processes in the area. During this process, very small fractures are developed in the rocks which enhances the contribution of radon gas to the soil near the surface of earth (Miklavčić et al, 2008). Three earthquake events were preceded by negative anomalies.…”

Section: Discussionmentioning

confidence: 99%

Singular spectrum and principal component analysis of soil radon (Rn-222) emanation for better detection and correlation of seismic induced anomalies

Chetia

Baruah

Dey

et al. 2019

Preprint

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Abstract. In the recent years there are several reporting’s of anomalous seismic induced temporal changes in soil radon emanation. It is however well known that radon anomalies apart from seismic activity are also governed and controlled by meteorological parameters. This is the major complication which arise for isolating the seismic induced precursory signals. Here in the investigation the soil radon emanations temporal variability at MPGO, Tezpur, is scrutinized in the lime light of singular spectrum analysis (SSA). Further prior applying SSA Digital filter (Butterworth low pass) is applied to remove the high frequency quasi periodic component in the time series of soil radon emanation. It was scrutinized that sum of just 9 eigenfunctions were sufficient enough for reproducing the prominent characteristics of the overall variation. This perhaps also evinces that more significantly produced fluctuations are mostly free from natural variations. The variations in soil temperature was observed to be dominated by daily variations similar to radon variation which account to 97.99 % whereas soil pressure accounts for 100 % of the total variance which suggests that daily variations of soil radon (Rn-222) emanation are controlled by soil pressure in MPGO, Tezpur during the investigation period followed by soil temperature. The study concludes that SSA eliminates diurnal and semidiurnal components from time series of soil radon emanation for better correlation of soil radon emanation with earthquakes.

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Section: Discussionmentioning

confidence: 99%

Singular spectrum and principal component analysis of soil radon (Rn-222) emanation for better detection and correlation of seismic induced anomalies

Chetia

Baruah

Dey

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…However, the origin and mechanism of the radon anomalies and their relationship to earthquakes are not fully understood yet. Number of attempts have been made worldwide to establish radon anomalies in soil (King 1980;Mogro-Campero et al 1980;Reddy et al 2004;Miklavčić et al 2008;Ghosh et al 2009), ground water (Hauksson 1981 andreferences therein, Virk andSingh 1993), hydrothermal system (Das et al 2006;Chaudhuri et al 2011) and mud-volcano (Chaudhuri et al 2012), as precursors for earthquakes. The anomalous emission of radon-222 correlated with geophysical events may be considered as having two possible origins; either it is produced in-depth origin, or, once produced locally, it is transported by other terrestrial fluid motion triggered by geodynamical events.…”

Section: Efficacy Of Radon-222 As Earthquake Precursormentioning

confidence: 99%

Anomalous soil radon fluctuations – signal of earthquakes in Nepal and eastern India regions

2016

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The present paper deals with pre-seismic soil radon-222 recorded at two different locations 200 m apart, at Jadavpur University main campus, Kolkata, India. Solid state nuclear track detector method is used for detection of the radioactive radon gas. Two simultaneous 4-month long time series data have been analysed. Anomalous fluctuations in the radon datasets have been observed prior to recent earthquakes in Nepal and eastern India during the monitoring period, mainly, the massive 25th April 7.8 M Nepal earthquake. The simultaneous measurements assist in identifying seismogenic radon precursor efficiently.

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“…The Earthquake of every magnitude at the distance (D) less than or equal to 10 km from the monitoring site is selected; Also in case of M ≥ 2, 10 < D ≤ 100; for M ≥ 3, 100 < D ≤ 200; and for M ≥ 4, D > 200 (Wattananikorn et al 1998;Planinić et al 2004;Miklavčić et al 2008). Table 6 shows the seven events selected from NW Himalaya data using the above criteria.…”

Section: Correlation Of Radon Anomalies In Soil and Water With Seismimentioning

confidence: 99%

Radon Monitoring in Soil Gas and Ground Water for Earthquake Prediction Studies in North West Himalayas, India

Singh¹,

Kumar²,

Bajwa³

et al. 2010

Terr. Atmos. Ocean. Sci.

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Continuous monitoring of soil gas radon at Sarol and the daily monitoring of radon concentration in water at Banikhet is carried out in Chamba valley of North West Himalayas, India "a well known seismic zone" to study the correlation of radon anomalies in relation to seismic activities of the region. Radon monitoring in soil gas was carried out by using Barasol probe manufactured by Algade France and the radon content in water was recorded using RAD7 radon monitoring system of Durridge Company, USA. The effect of meteorological parameters viz. temperature and pressure on soil gas radon emission has been studied. Correlation coefficient has been calculated between radon in soil gas, soil temperature and soil pressure. The radon anomalies observed in the region have been correlated with the seismic events in the magnitude range 2.2 to 5.0 recorded by Wadia Institute of Himalayan Geology Dehradun in NW Himalayan. Empirical equations between earthquake magnitude, epicentral distance and precursor time were examined, and respective constants were determined.

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Radon anomaly in soil gas as an earthquake precursor

Cited by 26 publications

References 8 publications

Singular spectrum and principal component analysis of soil radon (Rn-222) emanation for better detection and correlation of seismic induced anomalies

Singular spectrum and principal component analysis of soil radon (Rn-222) emanation for better detection and correlation of seismic induced anomalies

Anomalous soil radon fluctuations – signal of earthquakes in Nepal and eastern India regions

Radon Monitoring in Soil Gas and Ground Water for Earthquake Prediction Studies in North West Himalayas, India

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