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SEISMICITY OF STREI-HATEG BASIN
Abstract
The paper highlights the seismicity of the Strei-Hateg depressionary system. This system is situated in the western part of the Southern Carpathians, and consists of two intermountain, post orogenic basins, Hateg basin and Strei basin. These two basins are separated by a threshold. The seismicity is characterized by moderate magnitude with a maximum magnitude of 4 (Mw) (8 September 2013) and by the presences of the seismic sequences. In the area are known two seismic sequences, one in 2011 of 14 earthquakes of 2 to 3.3 magnitude, main shock of 3.3 (Mw) and one in 2013 of 30 earthquakes with magnitude of 2 to 4 (Mw), main shock of 4 (Mw). The hypocentral depths are in 5 to 13 km depth interval with two exceptions, one earthquake with 19.6 km hypocentral depth (2013/09/08) and the other with 23.8 km hypocentral depth (2013/09/11). The sequence of March 2011 is a seismic swarm, with three shocks of 3.1, 3.2, 3.3 (Mw) and the other shocks between an interval of 1.9пїЅ2.4 (Mw). The sequence of September 2013 has an earthquake of magnitude 4.0(Mw) considered as a main shock. It was preceded by 9 foreshocks and followed by 25 aftershocks. The focal mechanisms of the earthquakes indicate a strike slip predominant movement with slight normal or inverse components.
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