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ESTIMATING THE MAGNITUDE OF COMPLETENESS, b -VALUE AND SEISMIC ENERGY RELEASE FOR VRANCEA ROMANIA CRUSTAL EARTHQUAKES FOR THE LAST THREE DECADE
Abstract
The purpose of this study consists in the evaluation of completeness magnitude (Mc), b value spatial variation and seismic energy release in Vrancea crustal seismogenic area, during the period between 1990 and 2021. This parameters are essential for a correct interpretation of seismicity analysis. For the analyses, we have selected from the Romplus seismic catalog (www.infp.ro) the crustal events with depth 0<h<52 Km, and magnitudes 0.1 <Mw <5.4,recorded from 01 January 1990 to 01 March 2021, in the area bordered by 44.5 N - 46.5 N latitude and 26.0 E - 27.5 E longitude.The method we used to calculate Mc is based on the Goodnes of Fit test (GFT).The Mc completeness magnitude parameter is essential in seismology studies and represents the minimum value of the magnitude for which all events in a given region are correctly detected. The b value parameter is calculated taking into account the magnitude of completeness Mc and the average value of the magnitudes of events above the threshold value Mc The seismic energy release in Vrancea zone was calculated in the period 1990-2020 only for crustal depth earthquakes using Mw resulted from the seismic moment (Mo), parameter that measures the overall deformation in the source.
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