Arctic Ocean - multichannel seismic reflection profiles recorded during RV POLARSTERN cruise PS87

• Main Authors: Weigelt, Estella, Jokat, Wilfried, Eisermann, Hannes
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: Arctic Ocean; ARK-XXVIII/4 ALEX2014; AWI_GeoPhy; File format; File name; File size; Lomonosov Ridge; Marine Geophysics @ AWI; Polarstern; PS87; PS87_Lomonosov_Ridge; reflection seismics; SEGY-format; Seismic reflection profile; SEISREFL; Uniform resource locator/link to file; Arctic; Berichte zur Polar- und Meeresforschung; Reports on Polar and Marine Research
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.919774; https://doi.org/10.1594/PANGAEA.919774

A set of multichannel seismic reflection lines across the southeastern Lomonosov Ridge and adjacent basins was collected in 2014 during RV Polarstern cruise ARK XXVIII/3 (PS87). The data provide constraints on the coupled evolution of ocean circulations, deposition regime and regional tectonic processes. The survey set-up for most lines comprised a streamer of 3000 m length (240 channels), and a 24-liter G-gun array. Shots were fired every 15 s resulting into a shot point spacing of 35-40 m. Data were recorded for 12 s at a sample rate of 1 ms. The seismic data processing comprised sorting in a CDP interval of 25 m (= max. fold 145), and velocity analysis (every 100 CDP = 2.5 km). Interval velocities for the seismic units are adopted from the stacking velocities. After the removal of noisy traces and spherical divergence correction the traces were stacked and migrated with a finite-difference time-migration. For a successful suppression of sea floor multiple an f-k filter was applied. In general, the data were filtered with a band pass of 10 - 90 Hz, and an automatic gain control with a gate length of 1000 ms was applied. The dominant frequency of the seismic signals is about 35 Hz, which enables a maximum vertical resolution of about 11-18 m across the sedimentary units. A marked low-frequency reflector with reversed polarity parallels the sea floor at shallow water depths of 190 ms TWT (150 m). The signal turned out to be an arctefact, and in some parts the amplitude strength was succesfully attenuated by a designature filter. The presented data-set provides migrated seismic reflection seismic lines in segy-format.