Focal Mechanism Solutions For Vrancea Seismic Area

Abstract

The current study is focused on the problems of the analysis of focal mechanisms for the region of South-Eastern Carpathians, particularly of the Vrancea zone. The data from the ISC Bulletin for the period 1967–2006 were used in the study, to which the series of supplementary catalogues were added: HVD, M&P, ONC, ANSS, MED, ROM+, SBL, FSU, USGS in order to carry out a thorough complete analysis. As a result the focal mechanisms for about 250 catalogued events were obtained, which were projected on a uniform magnitude scale (Mw) for the geographic area in the limits: Latit. 44–50° and Longit. 24–30° for the continuum reference period of 40 years. Uncertainties in the data influencing focal mechanism solutions are discussed at the end of the paper.