An enigmatic strong reflector on subbottom profiler records from the Black Sea—the top of shallow gas hydrate deposits |
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| Authors: | J M Woodside D I Modin M K Ivanov |
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| Institution: | (1) Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands;(2) Department of Seismics and Geoacoustics, Faculty of Geology, Moscow State University, Vorobjevy Gory, 119899 Moscow, Russia;(3) UNESCO-MSU Centre for Marine Geology and Geophysics, Faculty of Geology, Moscow State University, Vorobjevy Gory, 119899 Moscow, Russia |
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| Abstract: | An anomalous strong, shallow reflector has been observed in several deep-tow subbottom profiler records in a region of the northern Black Sea characterised by seafloor fluid seeps, mud volcanoes, and the occurrence of gas hydrates. The digital data were processed using adapted seismic processing methods. Synthetic seismograms created to model representative traces from the observed profiles require anomalous alternations of acoustic properties in the upper sediments which can best be explained by interbedded layers of normal sediments and sediments with gas hydrates. The enigmatic strong reflector can be explained by constructive interference of reflections from five of these thin layers. It is proposed that the uppermost region of the gas hydrate stability zone here is represented by thinning layers of interbedded gas hydrates or layers with lower concentrations of gas hydrates. |
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