Abstract
Chemical and isotopic compositions of He, Ar, CH4(δ13C) of hot spring gas in Lancang and Batang earthquake regions show that the concentrations of He , H2 , non-atmospheric sourced N2 and 3He/4He value are closely related to seismic activity. During earthquake activity, gas release is related to the dilation that rocks take on under stress action. Earthquake magnitude (energy) between the two seismic regions suggests that the amount of released gas from rocks increases significantly with the increase of magnitude and energy. As indicators of earthquake prediction, the following parameters of gases from hot spring are effective: He, 3He/4He, H2 and N2B/N2total.
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