Pressure field and seismicity during geodynamic activation in the Altai Mountains
Category: 16-3UDC 550.344
O. I. Aptikaeva
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia
Abstract. In this paper we analyze variations of atmospheric pressure, recorded by hydrometeostations in the Altai Mountains during geodynamic activation of the region due to the severe Altai earthquake (September 27, 2003, М=7.5). We found that the rhythmic structure of the pressure field varies in space (depending on the position relative to the geodynamic active area) and in time. The annual rhythm in the time series of atmospheric pressure prevails at the periphery of the active tectonic zone. Its amplitude decreases in the zones of active faults. The rhythmic structure of variations of the atmospheric pressure observed several months before the Altai earthquake near its focal zone differs significantly from the structure of variations after the earthquake. After the Altai earthquake, when seismic activity decreased, the proportion of periodic components in the variations of the atmospheric pressure increases. We suppose that there is a relationship between variations in atmospheric pressure and released seismic energy. We give examples, which show that local or regional perturbations of the pressure field are followed by local or regional seismic events respectively.
Keywords: atmospheric and geodynamic processes, monitoring, ecology, the rhythms, the wavelet analysis.
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