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Current projects

  • Steep Dip Imaging at the San Andreas Fault at SAFOD
    Dr. Florian Bleibinhaus
  • Seismic Tomography Eastern Alps
    (DFG project BL 770/1-1)
    Dr. Florian Bleibinhaus
  • Shallow seismic shear-wave refraction for groundwater exploration
    Jan Walbrecker
    Conventional P-wave techniques have proven insufficient to resolve the topmost aquiclude in the Munich alluvial plain due to a very weak impedance contrast. A combined method of P- and SH-waves has been applied to delineate the thickness of the aquifer and to study attributes of the aquiferous gravel.
  • Steep-dip prestack-migration of TRANSALP seismic reflection data
    Robin Groschup
    TRANSALP is an international research project investigating the deep structure and the geodynamics of the Eastern Alps (see TRANSALP project). Its backbone is a seismic profile acquired during 98/99. The data have already been processed by CMP-stacking (see L├╝schen, E., Lammerer, B., Gebrande, H., Millahn, K., Nicolich, R, TRANSALP Working Group, 2004. Orogenic structure of the Eastern Alps, Europe, from TRANSALP deep seismic reflection profiling, Tectonophys. 388, 85-102.). However, this method is not ideal for imaging steeply dipping reflectors, which have to be expected particularly in the crystalline core of the Alps. The geometric position of dipping reflectors is often inadequately corrected for in poststack-migrated sections, and subvertical reflectors cannot be mapped at all. Therefore, a number of questions of scientific interest are to be answered, for example concerning the Periadriatic Line, a strike-slip fault separating the Eastern Alps from the Southern Alps.
    Compared to conventional stacking methods, prestack-migration is more complicated, more intricating and more sensitive with respect to errors in the velocity models, and that is why it has not been performed yet. However, by now a new 2D velocity model for the Alps along the TRANSALP transect has been derived by travel time tomography, which we regard as accurate enough for prestack-migration. Thus re-processing of the data with the proposed method is highly promising to produce interesting new results.
    Prestack-migration has become a widely-used tool in exploration industry since recent years, wherever geologic situations are too complicated for less sophisticated methods. Similar methods are becoming increasingly popular in seismology, e.g. for imaging the rupture process of the Sumatra-Andaman earthquake, 2004, with teleseismic-array recordings.

Project proposals

by Richard Bennett last modified 22. Jan 2009 09:09
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Printed 16. Sep 2019 00:44