HR: 0830h
AN: T31F-0893    [PDF]
TI: 2D Seismic Velocity Modelling in the Southeastern Romanian Carpathians and its Foreland (Vrancea Zone and Focsani Basin)
AU: * Stephenson, R
EM: randell.stephenson@falw.vu.nl
AF: Netherlands Centre for Integrated Solid Earth Sciences, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, Amsterdam, 1081 HV Netherlands
AU: Bocin, A
EM: bocin_and@yahoo.co.uk
AF: University of Bucharest, Department of Geology and Geophysics, University of Bucharest, Traian Vuia Street 6, Bucharest 1, 70139 Romania
AU: Tryggvason, A
EM: Ari.Tryggvason@geo.uu.se
AF: Uppsala University, Department of Earth Sciences, Uppsala University, Villavagen 16, Uppsala, 752 36 Sweden
AB: The DACIA-PLAN (Danube and Carpathian Integrated Action on Processes in the Lithosphere and Neotectonics) deep seismic reflection survey was performed in August-September 2001, with the objective of obtaining of new information on the deep structure of the external Carpathians nappes and the architecture of Tertiary/Quaternary basins developed within and adjacent to the seismically-active Vrancea Zone, including the rapidly subsiding Focsani Basin. The DACIA-PLAN profile is about 140 km long, having a roughly NW-SE direction, from near the southeast Transylvanian Basin, across the mountainous southeastern Carpathians and their foreland to near the Danube Dalta. A high resolution 2D velocity model of the upper crust along the seismic profile has been determined from a first-arrival tomographic inversion of the DACIA-PLAN data. The shallowing of Palaeozoic-Mesozoic basement, and related structural heterogeneity within it, beneath the eastern flank of the Focsani Basin is clearly seen. Velocity heterogeneity within the Carpathian nappe belt is also evident and is indicative of internal structural complexity, including the presence of salt bodies and basement involvement in thrusting, thus favouring some current geological models over others. The presence of basement involvement implies the compressional reactivation of pre-existing basement normal faults. Members of the DACIA-PLAN/TomoSeis Working Group (see poster) should be considered as co-authors of this presentation.
DE: 7205 Continental crust (1242)
DE: 7218 Lithosphere and upper mantle
DE: 8015 Local crustal structure
DE: 8110 Continental tectonics--general (0905)
DE: 8180 Tomography
SC: Tectonophysics [T]
MN: 2003 Fall Meeting