The Structural Fabric and Seismotectonic Activity of Northern Velebit: Some New Observations

Key-words: Earthquakes, Tectonic movements, Stress, DisplaceKljuZne rije* Potresi, Tektonski pokreti, Stres, Pomaci struktura, ment, Seismotectonically active zone Seizmotektonski aktivna zona A permanent seismotectonic activity is present in the region of U podrutju sjevernog Velebita stalno je prisutna seizmotektonska northern Velebit. Through history a number of earthquakes magniaktivnast. U povijesti se vise puta spminju potresi intenziteta VIIo i tudes of VIIP and I F MCS are reported. In this century the most 1x0 MCS. U ovom stoljdu najjaci potres dogodio se 1916. godine powerful earthquake of a magnitude of 5.8 occurred in 1916. The key magnitude 5,8. KljuEni tektonski pokreti koji uzrokuju pojavljivanje tectonic movements that cause these earthquakes are dislocations of trcsa jesu pomaci Jadranske platfotme prema sjeveru i odupiranje the Adriatic platform towards the north and the resistance of the Knarida tim pomacima. ~ektonska dinamlkastmkturnog sklopa o w i Dinarides towards these movements. Thc tectonic dynamics of a struco odnnw stresa i deformacija strukturnih jedinica. Prema podacima tural arrangement depend on the relationship between stress and the tercnskog mjerenja u izdancima najvdnijih rasjeda dobivena je orijendeformation of structural units. According to the tectonic measuretacija stresa: u sjevernom Velebitu 20D50-200/205o i u zaledu 340ments performed on outcrops of major faults the following orientation 1600. U strukturnom sklopu nastaje kompresija prostora osobito of stress was obtained. from 20/2S0 to 200D05° in the northern Velebit izrakna uko Novog Vinodolskog. Moguk deformacije struktura jesu region and 340 to 16Ctdin the hinterland. Within the structural arrangedijagonalni reversni pomaci u prostoru uz rotaciju struktura. U zaledu ment compression of space occurs which is well pronounced in the Novi sjcvernog Velebita utvrden je desni horizontalni tektonski transport. Vinodolski area. Possible deformation of structures is manifested U zoni transkurentnog rasjeda Auta Lokva-OtoCaoBuniC otvaraniem spatial dia onal reverse displacements accompanied by rotation of the prostora oblikuju se scukture tipa pull-a art Seizmotektonski aktivna structure. fn the Velebit hinterland right horizontal tectonic transDort zona miavliuie se u ~rostoru dodlra ~ a g a n s k e platforme i Dinarida. J VoI. 10