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- 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
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
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 Lüschen, 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
Printed 23. Apr 2017 07:35