CHARACTERISTIC FEATURES OF INDUCED SEISMIC PROCESSES IN MINING REGIONS EXEMPLIFIED BY THE POTASSIUM SALT DEPOSITS IN BELARUS AND BULGARIA

Abstract

This work focuses on the assessment of seismic risk issues associated with the potassium salt deposit of Provadia and Soligorsk, with the monitoring provided by Belarusian and Bulgarian specialists in the framework of a bilateral project. The long-term studies 1983-2005 of the only terrestrial Bulgarian salt deposit (Provadia, φ = 43.06°N, λ = 27.45°E) and Belarusian (Starobin φ = 52.84°N, λ = 27.47°E) in connection with the observed higher seismic activity and probable manifestations of technogenic seismicity in the region is presented. The characteristic features of the seismic processes as the identity of the curves of recurrence of seismic events of the energy range of 4 - 8 are discussed. A quasi-periodic character of the seismicity activation in time against the general trend of seismicity activation is established. It is shown that the zones of the epicenters of the seismic events are larger that mining areas. Some differences in the pattern of seismic processes, such as: 1. the seismic activity in the range of small energies (K = 4 - 8) is higher in the Soligorsk region; 2. events of the higher energy class, K > 9 are characteristic of the Provadia region. © 2006 Akadémiai Kiadó, Budapest.