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

• Main Authors: Dumke, Ines, Burwicz, Ewa, Berndt, Christian, Klaeschen, Dirk, Feseker, Tomas, Geissler, Wolfram H, Sarkar, Sudipta
• Format: Dataset
• Language: English
• Published: PANGAEA 2015
• Subjects: Comment; Date/Time of event; Date/Time of event 2; Event label; File name; File size; Latitude of event; Latitude of event 2; Longitude of event; Longitude of event 2; Maria S. Merian; MSM21/4; MSM21/4_548-1; MSM21/4_562-1; MSM21/4_608-1; MSM21/4_619-1; MSM21/4_646-1; MSM21/4_651-1; North Greenland Sea; Seismic profile P100-P102; Seismic profile P200-P208; Seismic profile P400; P500; Seismic profile P600; Seismic profile P700-P706; Seismic profile P800-P805; Seismic reflection profile; SEISREFL; Uniform resource locator/link to sgy data file; Greenland; Greenland Sea; North Greenland; Svalbard; Svalbard margin
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.847497; https://doi.org/10.1594/PANGAEA.847497

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.