Geo-acoustic modeling and visibility of sedimentary strata in high resolution sediment acoustic profiling records: case studies from Baltic Sea and Beibu Gulf, South China Sea.

Wednesday, 17 December 2014
Michael Endler1, Rudolf Endler1, Jens Wunderlich2, Bernd Bobertz3, Thomas Leipe1, Jørn Bo Jensen4, Matthias Moros1 and Helge W Arz1, (1)Leibniz Institute for Baltic Sea Research, Rostock, Germany, (2)Innomar Technologie GmbH, Rostock, Germany, (3)Ernst-Moritz-Arndt-University, Greifswald, Germany, (4)Geological Survey of Denmark and Greenland, Copenhagen, Denmark
Acoustic sub-bottom profiling methods are widely used to provide a rapid view into marine geological structures. But only gradients in acoustic impedance constitute acoustic reflectors which are not necessarily sedimentary boundaries. Based on comprehensive sediment core investigations geo-acoustic models were developed for the precise mapping of core data into acoustic profiles in order to improve the interpretation of high resolution acoustic sub-bottom profiles. These models allow the calculation of in situ sound velocity and wet bulk density either from core loggings or from selected sedimentological parameters such as water content, loss on ignition and grain size. Using these models, the acoustic visibility of sedimentary sequences is investigated and their performance is demonstrated on the interpretation of selected acoustic profiles / coring sites in the Baltic Sea and the Beibu Gulf.