Rare Gas Isotope Mass Spectrometric Method for Geology Research and Earthquake Monitor

The measuring method of rare gas isotope raios using the mass spectrometers developed by author for geology research and earthquake monitor is reported in the paper. We have measured 3He/4He and 4He/(20)Ne in Tibet Yangbajing Subterranean field and Changbaishan volcano field. The source of escaped rare gas in the two fields is researched. In addition, the continuouse monitor of 4He/(20) Ne. 4He/(40) Ar and (40)Ar/(36)Ar ratios in Taryun soil gas is carried out in order to study earthquake forecast. Some earthquake examples are obtained.