Deep-Seated Gas Emission Induced by the Earth Tide: A Basic Observation for Geochemical Earthquake Prediction

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Science  12 Jun 1981:
Vol. 212, Issue 4500, pp. 1264-1266
DOI: 10.1126/science.212.4500.1264


Variations of the helium/argon ratio of gas bubbles in a mineral spring along a fault zone coincide with fluctuations of areal dilation induced by the earth tide. This observation suggests that deep-seated gases characterized by higher heliumlargon ratios are squeezed out by stress preceding an earthquake.