Abstract
Earthquake-related changes in soil-gas and groundwater radon have been detected at a sensitive observation site in the Kangra valley, Himachal Pradesh, India, using both instantaneous and time-integrated techniques. The recording station at Palampur in the Kangra valley is located near the main boundary fault of the Himalayas. Eleven earthquake-related anomalies have been recorded since August, 1989 in both the soil-gas and in the groundwater simultaneously. In order to differentiate the real signal from noise, the effect of meteorological variables (soil and air temperature, rainfall, pressure, humidity and wind velocity) on radon emanation was also studied. Most of the radon anomalies are found to be correlated with earthquakes rather than to changes in meteorological conditions.
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