The Behavior of Seasonal Variations in Induced Seismicity in the Koyna–Warna Region, Western Indiaстатья
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Аннотация:Based on the earthquake catalog data for the Koyna–Warna region of induced seismicity in western
India, the seasonal variations in seismic activity associated with annual fluctuations in the reservoir water
level are analyzed over the time span of the entire history of seismological observations in this region. The
regularities in the time changes in the structure of seasonal variations are revealed. The seasonal seismic activity
is minimal in May–June when the reservoir level is lowest. During the remaining part of the year, the
activity has three peaks: the fall peak in September, winter peak in November–December, and spring peak in
February–March. The first mentioned peak, which falls in the phase of the water level reaching its maximal
seasonal value is considered as the immediate response of the fluid saturated medium to the additional loading
under the weight of reservoir water. The two subsequent maxima concur with the decline phase in the reservoir
level and are interpreted as the delayed response associated with the changes in the properties of the
medium due to water diffusion. It is shown that the intensities of the immediate and delayed responses to the
seasonal water level variations both vary with time as does their ratio. The probable factors affecting the variations
in the intensity of the seasonal components of the reservoir-induced seismicity are discussed.