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”.