Seismic Reflection Tomography: A Case Study of a Shallow Lake Survey in Lake Balaton
Pantelis M. Soupios1, Tamas
Toth2
(1) Department of Natural
Resources and Environment, Technological Educational Institute of Crete, 3 Romanou, Chalepa, 73133, Tel.:
+302821023037; Fax: +302821023003; E-mail: soupios@chania.teicrete.gr
(2) GEOMEGA Ltd, E-mail: info@geomega.hu
Abstract. Shallow
seismic reflection marine profiles were collected in the area of Balaton Lake in Hungary using high frequency boomer techniques, in order to get
information about the stratigraphy of the sedimentary
layers. The noise in these shallow marine seismic reflection data is analyzed,
and a series of traditional seismic data processing techniques is applied to
improve the S/N ratio and coherence. These are bandpass
filtering, muting, spectrum analysis, gain, deconvolution
and migration. The single fold of the survey did not allow velocity analysis to
be done.
Navigation control was
derived from global positioning system. The shipboard GPS antenna positions
were recorded for each shot at the time of trigger.
In addition, the
geometry and the geophysical characteristics of the sediments are reconstructed
by calculating the forward and inverse model. The inverse problem is solved by using the LSQR algorithm. In order to
speed up convergence and stabilize the inversion several approaches are
adopted, such as “damping” or “smoothing”.