Evaluation and comparative analysis of stress and deformations in seismic hazard zones in Bulgaria and adjacent lands

Valentina Nikolaeva Protopopova, Emil Alexandrov Botev

Abstract


In this paper an attempt to elucidate the geodynamic situation in Bulgaria and adjacent lands from a seismological point of view is proposed. The fault plane solutions of 418 earthquakes and corresponding stresses and deformations are also analyzed. For the purposes of the quantitative stress and strain modeling, a seismic zonation is carried out and the Bulgarian territory and surroundings are divided in nine seismic hazard zones. The main seismological and focal mechanisms characteristics for each zone are presented. The stress tensors for the zones/fault systems are calculated by inversion of the focal mechanisms data using the technique of Gephart [1990]. The released strain is computed by means of the moment tensors of focal mechanisms according to the relation of Kostrov [1974]. In general, the obtained mean strain tensors show some agreement with the calculated mean stresses. Several local discrepancies and the whole geodynamic situation are analyzed in the light of some present tectonic hypotheses. On the basis of the analysis of the seismicity, stress and deformation on the territory of North Balkans are presented.


Keywords


Earthquakes, Fault plain solutions, Stress, Deformations, Geodynamic, Tectonics

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References


DOI: https://doi.org/10.4401/ag-8125
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X