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Vol. 37, n.147, September 1995
pp. 233 - 242

The decay of aftershock sequences for Albania using the seismic activity data of 1976-1990

B. Muco

Abstract

Using 14 cases of earthquakes followed by aftershocks for Albania during the period 1976-1990, the aftershock decay constants according to the Omori law, and some characteristics of the energy release, are found here. The magnitudes of analysed sequences are from 3.5 to 5.5. The values of p, which describes the aftershock decay, with the modified Omori law, in this study fall in the range between 0.84 and 1.49. There is a distinct difference observed between the value of this coefficient determined for the inner zone and that determined for the outer zone of Albania. The increase in coefficient p from the west to the east of the country shows that there is a faster decay of aftershocks in the inner part than in the outer part. It is shown that on average the energy released by aftershocks is about 8 percent of the energy released by the main shock. The results obtained are discussed in the light of the seismotectonies and stress regime.

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