HR: 0830h
AN: S21F-0381    [PDF]
TI: Three-dimensional seismic modeling of crustal structure in the West-Pannonian basin (Trans-Danubia) based on CELEBRATION 2000 data
AU: * Fancsik, T
EM: fancsik@elgi.hu
AF: Eotvos Lorand Geohysical Inst., Columbus 17-23, Budapest, 1145 Hungary
AU: Kovacs, A C
EM: kacs@elgi.hu
AF: Eotvos Lorand Geohysical Inst., Columbus 17-23, Budapest, 1145 Hungary
AU: Csabafi, R
EM: csabafi@elgi.hu
AF: Eotvos Lorand Geohysical Inst., Columbus 17-23, Budapest, 1145 Hungary
AU: Kiss, J
EM: kiss@elgi.hu
AF: Eotvos Lorand Geohysical Inst., Columbus 17-23, Budapest, 1145 Hungary
AU: Hegedus, E
EM: hegedus@elgi.hu
AF: Eotvos Lorand Geohysical Inst., Columbus 17-23, Budapest, 1145 Hungary
AB: The Trans-Danubian part of the survey was designed to obtain not only in-line recordings along five profiles, but also fan recordings of the off-line shots. The station spacing was changing between 1,5 and 5 km, the average charge of the seismic shots were 500 kg TNT. The use of 409 single channel (Texan, PRS) recorders and 20 seismic sources provided a sufficient 3D ray coverage over an 250km * 240km area, and allowed for construction of a 3D model of the crustal structure. The seismic sections show clear first arrivals up to a distance of 180-200 km. For tomographic modeling 5700 picks of first arrivals were used. The P-wave velocity model was defined at equidistant nodes of the 3D rectangular grid. The distance between nodes was 0.5 km. The initial model used was established by apriori velocity data of the pre-Tertiary sediments. For the tomographic inversion of the areal data we used FAST package developed by C. Zelt (1998). The results of the 3D modeling of the CELEBRATION data were supplemented by inversion of previous seismic and other geological- geophysical data, which may enhance our understanding of the deep structure and evolution of the Trans-Danubian region.
DE: 7218 Lithosphere and upper mantle
SC: Seismology [S]
MN: 2003 Fall Meeting