Description: Three 2D reflection seismic profiles from three glacial cross-shelf troughs of the Labrador Shelf, namely the Okak, Makkovik and Cartwright troughs, are presented. The data were collected onboard the Maria S. Merian during cruise and MSM84 using two different multi-channel streamers; a Geometrics GeoEel solid state digital high-resolution streamer (active length 75 m, channel spacing 1.5625 m; hereafter short streamer) and a digital Sercel high-resolution streamer system (active length 600 m, channel spacing 3.125 m; hereafter long streamer). Details regarding the used seismic systems can be found in the cruise report (doi:10.2312/cr_msm84). Data were processed using the commercial VISTA Desktop Seismic Data Processing Software (Schlumberger, version 2018). The standard processing approach included demultiplexing, bulk shifting, frequency filtering (Ormsby as well as in the FK-domain), spiking deconvolution, compensation of spherical divergence and common-midpoint (CMP) binning. The CMP bin size was set to 3.125 m for both datasets. For the short streamer a normal-move-out correction with a constant sound velocity of 1500 ms-1 was performed as the limited offset range of short streamer did not allow for a precise velocity analysis. Afterwards, a static correction was applied as the short streamer was towed close to the water surface. Finally, a CMP stack was calculated followed by a finite differences time migration. The dataset of the long streamer shows a strong receiver ghost, which is related to the tow depth of approximately 10 m below the water surface. This receiver ghost was suppressed. Afterwards, a data-driven velocity analysis was carried out by picking seismic velocities for every 500 CMPs. Normal-move-out correction, CMP stacking and a finite differences time migration were carried out using the velocity field. Finally, a white noise removal was performed. The objective of data recording on the Labrador Shelf is to map glacial landforms and reconstruct the dynamics of the Laurentide Ice Sheet in detail.

Description: This 2D multi-channel seismic dataset was acquired during METEOR cruise M154-1 offshore Montserrat in April 2019. The dataset contains ~600 km of normal-moveout-corrected, stacked and migrated vertical seismic profiles. Aim of the seismic experiment was to map and image landslide deposits offshore Montserrat. The data was collected with a 81 m to 152 m-long (16 to 65 channels) streamer system with a group spacing of 1.56 m. The system consisted of two to seven 12.5 m-long active sections, a 25 m-long vibro-stretch section and a 31 to 40 m-long tow cable. As seismic source, two GI airguns (105/105 cubic inch) were shot every five seconds. Seismic data processing included trace editing, highpass filtering (25 Hz cut and 55 Hz slope corner frequencies), denoising, deconvolution, normal moveout correction, stacking and finite-difference migration with a gradient velocity model (1580 m/s to 1725 m/s). Detailed information on the data acquisition can be found in the M154-1 cruise report (https://doi.org/10.2312/cr_m154_1).

Description: Raw data acquired by position sensors on board RV MERIAN during expedition MSM113 were processed to receive a validated master track which can be used as reference of further expedition data. During MSM113 the motion reference unit Kongsberg SeaTex AS MRU-5 combined with Kongsberg SeaTex AS Seapath 320 and the GPS receivers Trimble SPS855 and SAAB R4 were used as navigation sensors. Data were downloaded from DAVIS SHIP data base (https://dship.bsh.de) with a resolution of 1 sec. Processing and evaluation of the data is outlined in the data processing report. Processed data are provided as a master track with 1 sec resolution derived from the position sensors' data selected by priority and a generalized track with a reduced set of the most significant positions of the master track.

Description: Echosounder data were acquired during cruise MSM87 with RV Maria S. Merian. The high-resolution parametricAtlas Parasound P70 (Atlas Hydrographic®) is a hull-mounted parametric echo sounder; the secondary low frequency (SLF) was set to 4 kHz through our cruises. The opening angle of the system is 4.5°. The system allows imaging of the uppermost 50-100 m of sediment at a sub-meter vertical resolution. The echogram sections were filtered with a wide band pass filter to improve the signal-to-noise ratio. The data were analyzed and interpreted in IHS Kingdom®.