engleski

Natural and controlled seismic experiment on the profile in transition area from the Dinarides to Pannonian basin

The area of north-western Dinarides and south-western Pannonian basin has been recently explored by two large international seismic experiments. These are active seismic experiment ALP 2002 and recent passive seismic project ALPASS-DIPS (Alpine Lithosphere and Upper Mantle PASsive Seismic Monitoring - DInarides-Pannonian Segment). Our analysis was carried out on profile Alp07, stretching from Istra to the Drava River at Hungarian–Croatian border in a WSW–ENE direction. A rather precise velocity model of the crust and upper mantle has been defined based on tomographic inversion and forward modelling. During the ALPASS-DIPS project temporary seismic stations have been deployed along the Alp07 profile. Teleseismic events recorded at seismic stations were processed using P-receiver function method. Receiver functions have been calculated for all stations along Alp07 profile (Cro_01 to Cro_12) and for station CBP4M located in the northeastern extension of the profile. The arrival times of Ps conversions at Mohorovičić discontinuity are the greatest under the Dinarides (6.6 s). Ps conversion at Moho in the transition zone becomes shallower, with Ps time between 5.5 and 5 s. The minimum Moho Ps time is observed in the Pannonian part, in the range from 3.8 to 4.5 s.

Dinarides; Pannonian basin; crustal structure; wide-angle seismic refraction; receiver function

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