recurrent earthquakes

Relative locations of the two groups of 2005–2006 Mukacheve series of recurrent earth­quakes were determined using an algorithm designed based on an assumption that a grade of cross-correlation between the records of recurrent events at the same station decays exponentially with separation between their sources, the locations turning out to arrange into almost a flat surface in each of the groups.

Three groups of recurrent earthquakes have been identified within the Mukacheve series of 2005–2006. After relocation with application of differential arrivals and station terms their sources arranged into almost a vertical plane along the azimuth of ~120°, approximately coinciding with a plane of normal faulting determined for all the earthquakes as a single source mechanism.

Purpose. The purpose of this paper is to show the importance of the additional information to determine the focal mechanisms of earthquakes in the Carpathian region of Ukraine, and also to determine the focal mechanisms and the spectral parameters of recurrent earthquakes. Methodology. The graphic method is proposed to determine the focal mechanisms of earthquakes in the region with a small seismic activity. This method is based on the distribution of the longitudinal P- wave polarities into compressive and extensive zones devised by nodal planes.

stable tendency of converging, from different sets of randomly seeded initial locations, to virtually indistinguishable final sets of locations, within each of the groups.