Abstract
In this paper, attention is paid to the importance of short-term prognosis of earthquakes. The variability of determination methods is noted. One of the geochemical methods, based on study of the helium content in deep water of Lake Baikal, is considered; such a method has not been used for open deep-water basins within the zones of high seismic danger. It is established that in the period of earthquake preparation, variations in the helium content deep underwater in Lake Baikal are recorded. A sharp decrease in the helium content two days before the earthquake was recorded first time for a long period of observation, as well as the consequent increase. Further study of the helium content deep underwater in Lake Baikal is recommended, and, should these data be proved, it is recommended as a short-term precursor of earthquakes.
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