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ANALYSIS OF THE FAULT PLAN SOLUTIONS USING P WAVES POLARITIES AND AMPLITUDE RATIOS FOR THE SEQUENCE OF NOVEMBER 22, 2014 RECORDED IN VRANCEA REGION

PhD.Eng Cristian Ghita, PhD Andreea Craiu, PhD Marius Craiu, Senior Researcher Mihail Diaconescu, PhD Alexandru Marmureanu

Abstract

The moderate-size earthquake with local magnitude 5,7 which occurred on November 22, 2014 in Vrancea region, at 41 km depth, is the largest crustal event instrumentally recorded at the bending of the Eastern Carpathians. Using the method developed by [2] termed the Hash method, (incorporated in Seisan software) we obtain the focal mechanisms for earthquakes that occurred in Vrancea region associated with the seismic sequence of November 22, 2014. We have examined the main shock and 29 aftershocks that occurred after 22 November 2014. P-wave arrivals and polarities are manually identified on the vertical component of each station. Polarities are marked as impulsive or emergent and the pick is given a quality rating (0- 4). We then use the S/P amplitude ratios computed from three?component seismograms, to determine mechanisms- Hash [2]. We had also investigate the spatial variation in focal mechanism type (e.g. strike-slip, normal, or thrust) and inferred fault strike. Most of the mechanisms are normal faulting, with the nodal planes oriented SE - NW, in agreement with the tectonic characteristics of the zone.This crustal seismicity is related to the normal fault system associated to Peceneaga - Camena major fault, which separates the Focsani Basin, part of the Moesian Platform, from the North Dobrogea promontory.

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DOI resolver: doi.org/10.5593/sgem2017/14/s05.003

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