| HYDROGEOCHEMICAL FACTORS PRECEDED LARGE EARTHQUAKES IN KAMCHATKA: IDENTIFICATION ALGORITHM AND MORPHOLOGICAL ANALYSIS |
G.V. Ryabinin, Yu.M. Khatkevich 1Kamchatka Branch of the Russian Academy of Sciences, Geophysical Survey RAS, Petropavlovsk-Kamchatsky, 683006; e-mail: gena@emsd.iks.ru The long-term data obtained from observations of the dynamics of underground water in Kamchatka permits conducting analyses of hydrological and geochemical factors preceded large earthquakes (magnitude M≥6.0, epicentral distance S≤350 km). The paper considers methods of data pre-processing and retrospective identification of anomalous variations in chemical and gas composition of underground water. Morphological analysis of the hydrogeochemical effects revealed the most likely precursors of large seismic events. |
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