Seismic Data from MSM21/4 to Knipovich Ridge on the western Svalbard margin


The seismic data were acquired north of the Knipovich Ridge on the western Svalbard margin during cruise MSM21/4. They were recorded using a Geometrics GeoEel streamer of either 120 channels (profiles p100-p208) or 88 channels (profiles p300-p805) with a group spacing of 1.56 m and a sampling rate of 2 kHz. A GI-Gun (2×1.7 l) with a main frequency of ~150 Hz was used as a source and operated at a shot interval of 6-8 s.Processing of profiles p100-p208 and p600-p805: Positions for each channel were calculated by backtracking along the profiles from the GI-Gun GPS positions. The shot gathers were analyzed for abnormal amplitudes below the seafloor reflection by comparing neighboring traces in different frequency bands within sliding time windows. To suppress surface-generated water noise, a tau-p filter was applied in the shot gather domain. Common mid-point (CMP) profiles were then generated through crooked-line binning with a CMP spacing of 1.5625 m. A zero-phase band-pass filter with corner frequencies of 60 Hz and 360 Hz was applied to the data. Based on regional velocity information from MCS data [Sarkar, 2012], an interpolated and extrapolated 3D interval velocity model was created below the digitized seafloor reflection of the high-resolution streamer data. This velocity model was used to apply a CMP stack and an amplitude-preserving Kirchhoff post-stack time migration.Processing of profiles p400-p500: Data were sampled at 0.5 ms and sorted into common midpoint (CMP) domain with a bin spacing of 5 m. Normal move out correction was carried out with a velocity of 1500 m s-1 and an Ormsby bandpass filter with corner frequencies at 40, 80, 600 and 1000 Hz was applied. The data were time migrated using the water velocity.

Supplement to: Dumke, Ines; Burwicz, Ewa; Berndt, Christian; Klaeschen, Dirk; Feseker, Tomas; Geissler, Wolfram H; Sarkar, Sudipta (2016): Gas hydrate distribution and hydrocarbon maturation north of the Knipovich Ridge, western Svalbard margin. Journal of Geophysical Research: Solid Earth, 121(3), 1405-1424

Related Identifier
Metadata Access
Creator Dumke, Ines; Burwicz, Ewa ORCID logo; Berndt, Christian ORCID logo; Klaeschen, Dirk (ORCID: 0000-0002-8034-684X); Feseker, Tomas; Geissler, Wolfram H (ORCID: 0000-0001-6807-555X); Sarkar, Sudipta ORCID logo
Publisher PANGAEA
Publication Year 2015
Rights Licensing unknown: Please contact principal investigator/authors to gain access and request licensing terms; Data access is restricted (moratorium, sensitive data, license constraints)
OpenAccess false
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 32 data points
Discipline Earth System Research
Spatial Coverage (4.031W, 78.376S, 9.682E, 80.031N); North Greenland Sea
Temporal Coverage Begin 2012-08-17T20:16:00Z
Temporal Coverage End 2012-09-03T17:08:00Z