Dumke, Ines; Burwicz, Ewa; Berndt, Christian; Klaeschen, Dirk; Feseker, Tomas; Geissler, Wolfram H; Sarkar, Sudipta (2015): Seismic Data from MSM21/4 to Knipovich Ridge on the western Svalbard margin. PANGAEA, https://doi.org/10.1594/PANGAEA.847497, Supplement to: Dumke, I et al. (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, https://doi.org/10.1002/2015JB012083
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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.
Median Latitude: 78.754722 * Median Longitude: 7.490028 * South-bound Latitude: 78.376500 * West-bound Longitude: 4.030670 * North-bound Latitude: 80.030830 * East-bound Longitude: 9.682000
Date/Time Start: 2012-08-17T20:16:00 * Date/Time End: 2012-09-03T17:08:00
Minimum Elevation: -4057.6 m * Maximum Elevation: -174.7 m
MSM21/4_548-1 (Seismic profile P100-P102) * Latitude Start: 78.544670 * Longitude Start: 9.682000 * Latitude End: 78.594000 * Longitude End: 8.477330 * Date/Time Start: 2012-08-17T20:16:00 * Date/Time End: 2012-08-18T08:15:00 * Elevation Start: -196.7 m * Elevation End: -909.8 m * Location: North Greenland Sea * Campaign: MSM21/4 * Basis: Maria S. Merian * Device: Seismic reflection profile (SEISREFL)
MSM21/4_562-1 (Seismic profile P200-P208) * Latitude Start: 78.627170 * Longitude Start: 9.173830 * Latitude End: 78.526830 * Longitude End: 8.341000 * Date/Time Start: 2012-08-19T17:54:00 * Date/Time End: 2012-08-20T09:23:00 * Elevation Start: -490.2 m * Elevation End: -1296.0 m * Location: North Greenland Sea * Campaign: MSM21/4 * Basis: Maria S. Merian * Device: Seismic reflection profile (SEISREFL)
MSM21/4_608-1 (Seismic profile P400, P500) * Latitude Start: 80.030830 * Longitude Start: 5.586170 * Latitude End: 79.582170 * Longitude End: 4.030670 * Date/Time Start: 2012-08-27T14:16:00 * Date/Time End: 2012-08-27T22:16:00 * Elevation Start: -922.1 m * Elevation End: -4057.6 m * Location: North Greenland Sea * Campaign: MSM21/4 * Basis: Maria S. Merian * Device: Seismic reflection profile (SEISREFL)
|#||Name||Short Name||Unit||Principal Investigator||Method||Comment|
|1||Event label||Event||Berndt, Christian|
|2||Date/Time of event||Date/Time||Berndt, Christian|
|3||Latitude of event||Latitude||Berndt, Christian|
|4||Longitude of event||Longitude||Berndt, Christian|
|5||Date/Time of event 2||Date/Time 2||Berndt, Christian|
|6||Latitude of event 2||Latitude 2||Berndt, Christian|
|7||Longitude of event 2||Longitude 2||Berndt, Christian|
|8||File name||File name||Berndt, Christian|
|9||File size||File size||kByte||Berndt, Christian|
|10||Uniform resource locator/link to sgy data file||URL sgy||Berndt, Christian|
|11||Comment||Comment||Berndt, Christian||seismic profile|
32 data points