Investigation of the Deep Structure in the Region of Prodavya with the Method of Microseismic Sounding According to Data of LSN Provadia

摘要

Presented is an application of a method for constructing a deep inhomogenity on the base of the relative variation of the amplitudes of Rayleigh waves and relative contrast of seismic velocities. Depth microseismic drilling method uses the ambient microseismic noise, it does not utilise active sources and it has a good resolution. Advantages of the method are the modern environmental requirements for study which does not consist of explosions of deep incision and the low cost of carrying out the measurements, especially for significant depths. Results of data processing, by 6 broadband seismic stations, from the local seismic network in region of town Provadia in the territory of East Bulgaria are presented in this study. Provadia region is one of the most specific and curious seismic regions in Bulgaria. The seismic potential, the location of the zone near the big cities (as Varna for example), makes this zone dangerous and put it at high seismic risk. The most important purpose in this case should be defined as establishing the seismic generation properties of the Provadia region. To do this, it is necessary to study in details the deep interior around the seismogenic source in the region of Provadia trying to establish all peculiarities with high resolution.