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| PRESENTATIONS |
| AGU FALL MEETING in San Francisco, 06-10 December 2002 |
| ABSTRACTS |
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Brueckl E. and ALP2002 Working Group, 2002. ALP2002: A Seismic Experiment to Explore the Alpine Lithopshere. ALP2002 is an international seismic experiment whose scientific objective is to further scientific understanding of the structure and evolution of the lithosphere in the Eastern Alps and surrounding areas of the Bohemian Massif, the Pannonian basin and the Dinarides. This effort included passive seismic monitoring during portions of June and July 2002 and an active source seismic refraction experiment conducted from 1-6 July 2002. During the active source seismic experiment, 31 appropriately designed seismic shots were fired and about 1000 portable seismic recorders were deployed along 13 lines with a total length of about 4300 km. Furthermore, local high-density deployments and additionally 8 smaller shots were carried out in Austria and Hungary. The ALP2002 was designed to merge perfectly into the CELEBRATION 2000 experiment, and it is tied to the TRANSALP reflection line on the west. All record sections are ready being interpreted and samples of recordings demonstrating the high quality of the data will be presented. By merging the data from ALP2002 with the data from the third deployment of CELEBRATION 2000 a unique data set will be generated. A joint interpretation of this data from them will produce a 3-D model of the crust and mantle lithosphere that will resolve the major plate tectonic features. Furthermore, it will support the planning and interpretation of future deep seismic reflection lines in this area and will aid in our understanding of earthquake activity. |
| Behm, M. and CELEBRATION 2000 Working Group, 2002. The CELEBRATION 2000 Experiment: Results from the Alpine Area. The northeastern part of the Eastern Alps was covered by the third deployment of CELEBRATION 2000. Both inline and cross line shots from this experiment supplied essential travel time information for Pg, PmP and Pn arrivals. From this information, a preliminary 3D model has been derived. The parameters of this model are given at grid points with a regular spacing in X and Y of 20 km. The grid extends from the Alpine area to the Bohemian Massif, the Carpathians and the Pannonian basin. The thickness of sediments above the crystalline basement was calculated by a 3D delay time method. The P-wave velocity structure of the crust was obtained by automatic 1D tomographic inversions using CMP-sorted data within a predefined search radius around the grid points. The calculation of Moho-depths and Pn-velocities again was based on the delay time method. PmP arrivals supply additional constraints on the P-wave velocities of the lower crust and Moho-depths. The suitability of the starting model was checked by dynamic 3D ray tracing. Furthermore, 2D-sections following the lines CEL07 and CEL10 through the 3D model were compared with the results of 2D tomographic inversions and 2D modelling by ray tracing. These results were promising, and substantial extension of the model will be possible by the integration of the new data set which was acquired during the ALP2002 experiment. * The listing of the CELEBRATION 2000 Working Group can be found on our website. http://paces.geo.utep.edu/celebration.shtml |
update 2006-08-23
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