High-resolution seismic studies of gas hydrates west of Svalbard |
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| Authors: | Jörg Posewang Jürgen Mienert |
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| Affiliation: | SFB 313, Christian-Albrechts-University, Olshausenstr. 40, D-24118 Kiel, Germany, DE
Department of Geology, University of Troms?, Dramsveien 201, N-9037 Troms?, Norway, NO
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| Abstract: | A strong bottom-simulating reflection (BSR) with high-amplitude variations is detectable in high- resolution reflection seismic profiles west of Svalbard. Above the BSR, anomalously high velocities up to 1840 m/s, calculated from high-frequency ocean-bottom hydrophone (HF-OBH) data, indicate the existence of gas-hydrated sediments. Below the BSR, a low-velocity layer, interpreted as gas-bearing sediments, shows thickness variations from 12 to 25 m. In addition, two other low-velocity layers clearly containing free gas are detected within the classic hydrate stability zone (HSZ) where, a theoretical viewpoint, free gas cannot exist. Received: 6 August 1997 / Revision received: 26 January 1998 |
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