Explosive helium burst in thermal spring emanations

An observation has been made of an explosive helium burst showing an anomalous concentration of helium of ∼61.6 vol% compared to the ∼1.4 vol% normally present in the thermal spring gas emanations at Bakreswar, West Bengal. This elevated level, along with deuterium ∼1.7 vol%, has been observed for the first time in a gas chromatograph. Attempts have been made to correlate the observations, as a precursory signal, with some recent major tectonic disturbances.