ASSESSMENT OF DISCREPANCIES IN IDENTIFICATION OF MAGNITUDES OF TELESEISMIC EARTHQUAKES FOR THE STATIONS OF VORONEZH OBSERVATION NETWORK

Abstract

The paper presents results of detailed analysis of range of magnitude MS values for teleseismic earthquakes recorded by seismic stations of Voronezh network (VMGSR) with regards to values presented in the cumulative bulletin of FRC UGS RAS and Obninsk station bulletin. Based on more than 1000 earthquakes with magnitude MS of more than 4 from different regions with epicentral distances from 100 to 1800, deviations in identification of the magnitude (ΔМ) are calculated and distribution scheme of ΔМ was created. It was established that ~90% of the magnitude values of earthquakes recorded by seismic stations of VMGSR network, do not have deviations of more than allowed errors with regards to the values in cumulative bulletin of FRC UGS RAS. At the same time, areas with deviation of magnitude values of more than allowed ones were identified with regards to the cumulative bulletin of FRC UGS RAS, both with “+” sign and “−” sign. The purposefulness of recording of errors on the value of −0.3 of magnitude MS for the earthquakes with epicenters in the vicinity of Japanese islands was shown; this increases the share of events, for which the magnitude is identified without deviations with regards to the cumulative bulletin of FRC UGS RAS.