Abstract
<p>Soil radon data were recorded at two selected sites along Mat fault in Mizoram (India), which lies in the highest seismic zone in India. The study was carried out during July 2011 to May 2013 using LR-115 Type II films. Precursory changes in radon concentration were observed prior to some earthquakes that occurred around the measuring sites. Positive correlation was found between the measured radon data and the seismic activity in the region. Statistical analysis of the radon data together with the meteorological parameters was done using Multiple Regression Method. Results obtained show that the method employed was useful for removing the effect of meteorological parameters and to identify radon maxima possibly caused by seismic activity.</p>
Highlights
Variation of radon concentration in soil can give evidence on tectonic disturbances in the Earth’s crust [King1986]
[Kraner et al 1964, Pearson 1967, Singh et al 1988, King and Minissale 1994, Virk et al 2000, Zmazek et al 2003, Walia et al 2005]. These parameters change the physical characteristics of the soil and affect the soil radon variation caused by geophysical processes
The present paper describes the multiple regression method to differentiate those radon anomalies which are solely caused by seismic events and not by meteorological parameters
Summary
Variation of radon concentration in soil can give evidence on tectonic disturbances in the Earth’s crust [King. The changes in radon concentration are controlled by seismic activity and influenced by meteorological parameters like soil moisture, rainfall, temperature, barometric pressure and relative humidity [Kraner et al 1964, Pearson 1967, Singh et al 1988, King and Minissale 1994, Virk et al 2000, Zmazek et al 2003, Walia et al 2005]. Northeast India is seismically one of the six most active regions of the world, the other five being Mexico, Taiwan, California, Japan and Turkey It lies at the junction of Himalayan arc to the north and Burmese arc to the east [Jaishi et al 2014a, Singh et al 2014]. The tracks are counted at a voltage corresponding to plateau region of the counter (around 450V)
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