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Seismicity and seismotectonics at the Alps-Dinarides contact

A. Del Ben, I. Finetti, A. Rebez and D. Slejko


All seismic event data collected in the Friuli and Slovenia regions have been carefully analysed and their correct 3-D space distribution correlated on the up-to-date structural and tectonic setting reconstructed from geological and geophysical exploration data. On the basis of the large amount of information obtained, it is possible to propose a kinematic and seismotectonic model which satisfactorily fits the whole distribution of seismic events and their distinct characteristics. The regional geodynamic activity is determined by a clear NNW motion of the Adria plate with overthrusting effects along the Southern Alps (Pordenone, Periadriatic and successive thrusts). New very active and important seismotectonic elements are now clearly identified and defined: the Rijeka and Idrija transpressive strike-slip faults. These faults disconnect the Adria plate, allowing its relative northward motion. Other active transpressive thrust-faults with transcurrent components are identified and examined (i.e. Gorizia, Rasa and Postojna faults). Trieste and Udine transpressive reverse faults were active in Paleocene times and reactivated during the Pliocene to late Quaternary , but are historically slightly to non-significantly active.