Naslov
ALP 2002 Experiment - 2D Raytracing modelling and seismic tomography of selected profiles

Autori
Bleibinhaus, Florian ; Brueckl, Ewald ; Gosar, Andrej ; Grad, Marek ; Hegedus, Endre ; Hrubcova, Pavla ; Keller, G. Randy ; Šumanovac, Franjo ; Yliniemi, Jukka ; ALP 2002 Working Group

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Proceedings of the 32nd IGC, Florence, Italy / - , 2004

Skup
32nd International Geological Congress - Florence

Mjesto i datum
Firenca, Italija, 20.08.2004. - 28.08.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
continental crust; controlled source seismology; raytracing modelling; seismic tomography

Sažetak
The transition zone between the Alps, Dinarides and Pannonian basin was explored in the frame of the international project ALP 2002 using deep seismic refraction/wide-angle reflection method. Following the successful deep seismic reflection profiling in Central and partly in Eastern Alps and refraction experiments conducted in the northern part of the Central Europe, it was very important to extend the investigations also to this key area, in order to improve the understanding of the collision and lateral extrusion mechanisms of European, Adriatic (African) and Tisza plates. For the controlled source experiment more than 1000 single channel portable seismographs were deployed in 7 countries along 13 lines with a total length of 4300 km. Nominal spacing was 3 km along four high-density lines and 6 km along low-density lines. During 2-5 July 2002 32 strong explosions (300 kg charge in average) were fired at shot points distributed in 5 countries. The geometry of ALP 2002 lines was designed to mesh with the CELEBRATION 2000 experiment, and is tied to the TRANSALP seismic reflection line on the west. Furthermore, passive monitoring was performed along two profiles using 70 three-component seismographs. Different processing and interpretation methods are used in data elaboration from delay time decomposition, 2D and 3D ray-tracing modelling and tomographic inversion to signal detection and stacking techniques. In this work the preliminary results of 2D ray-tracing modelling and back-projection tomography along selected lines are presented. 2D velocity models give good insight into variation of the crustal thickness and of other crustal properties (e.g. thickness of the sediments). We concentrated mainly on two longest high-density lines. Alp01 profile extends in N-S direction from NW of Prague to Istra peninsula. It gives transect from the Bohemian massif across the Alps to the Adriatic platform. Alp02 profile extends in NW-SE direction from Innsbruck to Slavonski Brod across the Alpine, Dinaric and Pannonian basin structures. Lines which partly overlap with the CELEBRATION 2000 profiles (Alp04 and Alp08) or TRANSALP project (Alp12) were also modelled and three parallel profiles recorded in the SE part of investigated area (Alp05-Alp07). We expect that the collected data will allow construction of a three-dimensional model of the lithosphere in the Central Europe and will contribute to the understanding of the tectonics and geodynamics of this complex area.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

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