HYDROGEOLOGICAL PROBLEMS EMERGING IN INTENSIVELY CULTIVATED SEISMICALLY ACTIVE REGIONS
Journal Title: Вісник Одеського національного університету. Географічні та геологічні науки - Year 2014, Vol 19, Issue 3
Abstract
In the Crimean seismically active region’s urban population is over 65 %. All large cities, sanatorium-resort centers are located in 7 – 8 magnitude seismic zones. Therefore, the forecasting of earthquakes on the basis of the system seismogeological monitoring is so important.In the intensively cultivated regions, underground waters are the main source of water supply. Water selection violates the natural conditions of formation of water and there are problems in identifying precursors of earthquakes. Therefore, the goal of research is selection of aquifers, individual sections within them, with undisturbed regime, the rationale of hydrogeological parameters for forecasting earthquakes. The goal led to the methodology works. In the first phase were selected promising areas within the artesian aquifers that meet the requirements for ensuring the purity of the obtained information (no factors which violate the regime of underground waters) and made seismogeological zoning. In the second stage the organization of observation points and selection of optimal parameters was performed. The third main stage, observations of variations of selected parameters (level of groundwater, physical-chemical, hydro-geochemical) was produced in a continuous and discrete-continuous modes. Analysis of the obtained data was performed with the help of special computer programs. Before earthquakes periods we distinguished violations correlation between the level pressure water and atmospheric pressure, duration 2 -18 days, depending on magnitude and distance from the epicenter observation wells. Confirmation of the effectiveness of the method is the measure of the probability of earthquakes (53 % – 71 %). Indicators of the implementation of transition of the redox potential from negative to positive for 1 – 2 days before the earthquake reached 95 %. Conclusions: – Rapidly react to changes of the stressed state of the rocks photometrically level, redox potential, chlorine-ion and helium. – Abnormal violations of variations in the groundwater level and of sign changes in the redox potential in preparation of earthquakes, due to local significant earthquakes in the Crimean seismically active region, that are medium-short-term precursors of earthquakes.
Authors and Affiliations
A. V. Luschik, N. I. Shvyrlo
Keywords
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