Beschreibung: Between 08.08.2003 and 02.09.2003, bathymetric data was acquired offshore Guatemala and Costa Rica during the R/V SONNE cruise SO173/2. The expedition comprised geophysical and biological research objectives. One aim was the acquisition of geophysical data for a better understanding of recent and long-term evolution of the Middle America Landbridge and mass flux into the subduction system. Moreover, the cruise was also dedicated to studying the sensory systems of mesopelagic fish, cephalopods, crustaceans and teleosts by using trawl gear and morphometric studies. Bathymetric mapping with the multibeam echosounder (MBES) SIMRAD EM120 was utilized to obtain a full coverage bathymetric map along the El Salvador and Guatemalan continental slope and to complete previous maps by filling gaps along the continental slope and oceanic plate of Nicaragua. Further geophysical instruments, such as the sub-bottom profiler PARASOUND, magnetometer, a dredge and seismic instrumentation, and biological equipment including trawling gear and lab instrumentation, complemented the research equipment. CI Citation: Paul Wintersteller (seafloor-imaging@marum.de) as responsible party for bathymetry raw data ingest and approval. Description of the data source: During the SO173/2 cruise, the hull-mounted multibeam echosounder (MBES) SIMRAD EM120 was utilized to perform bathymetric mapping. It allows to conduct surveys in water depths of up to 11,000 m. Two transducer arrays transmit successive frequency coded acoustic signals (11.25 to 12.6 kHz). Data acquisition is based on successive emission-reception cycles of the signal. While the emission beam has a dimension of 150° across and 2° along track, the reception is obtained from 191 overlapping beams with widths of 2° across and 20° along track. The beam footprint has a dimension of 2° by 2°. The beam spacing can be set to equidistant or equiangular. For further information on the system, consult: https://www.km.kongsberg.com/ Depth is estimated from each beam by using the two-way travel time and the beam angle known from each beam, and taking into account the ray bending due to refraction in the water column by sound speed variations. Combining phase and amplitude is used to provide measurement accuracy practically independent of the beam pointing angle. During the SO173 cruise, the EM120 was used continuously. At the beginning of the cruise, a sound velocity profile was measured to a depth of 2000 m. Responsible person during this cruise / PI: Wilhelm Weinrebe (wweinrebe@ifm-geomar.de) Chief Scientist: Wilhelm Weinrebe (wweinrebe@ifm-geomar.de) CR: http://oceanrep.geomar.de/13407/1/Geomar-Report-116.pdf CSR: https://www2.bsh.de/aktdat/dod/fahrtergebnis/2003/20040060.htm This dataset was published as part of: Geersen, Jacob (2019): Collated bathymetric data from convergent margins that experienced tsunami earthquakes. PANGAEA, https://doi.org/10.1594/PANGAEA.899049

Beschreibung: We provide a processed gravity (Free-air anomaly) dataset collected in the equatorial Atlantic during ILAB-SPARC experiment conducted aboard N/O Pourquoi Pas? in Fall 2018.

Beschreibung: Between 12.11.2003 and 30.12.2003, bathymetric data was acquired in the Gulf of Cadiz during the R/V SONNE cruise SO175. The expedition aimed at a better understanding of the interaction between dynamic processes in a seismically active region with slow plate convergence. In the context of earthquake nucleation and subduction zone processes, the multidisciplinary research programme focused on physical and chemical behavior of sediments, pore water and fluids, exploration of the temperature field of the 1755 thrust earthquake event, the quantification of microbial activity, faunal assemblages, gas hydrates and the deployment of a long-term pressure probe. Bathymetric mapping with the multibeam echosounder (MBES) SIMRAD EM120 was utilized to image the nature of the Gibraltar Arc thrust wedge, a proposed subduction zone, and identify possible sampling sites. Sub-bottom profiling, seismic reflection imaging, heat flow measurements, the deployment of an Ocean Floor pore pressure system as well as video-guided systems and coring complemented the research programme. CI Citation: Paul Wintersteller (seafloor-imaging@marum.de) as responsible party for bathymetry raw data ingest and approval. Description of the data source: During the SO175 cruise, the hull-mounted multibeam echosounder (MBES) SIMRAD EM120 was utilized to perform bathymetric mapping. It allows to conduct surveys in water depths of up to 11,000 m. Two transducer arrays transmit frequency coded acoustic signals (11.25 to 12.6 kHz). Data acquisition is based on successive emission-reception cycles of the signal. While the emission beam has a dimension of 150° across and 2° along track, the reception is obtained from 191 overlapping beams with widths of 2° across and 20° along track. The beam footprint has a dimension of 2° by 2°. The beam spacing can be set to equidistant or equiangular. For further information on the system, consult: https://www.km.kongsberg.com/ During the cruise, an opening angle of 60-70° was used depending on the state of the sea, restricting the coverage to a maximum 14 km wide swath to gain a more continuous spacing of beams on the ocean floor. The spacing within these limits was controlled automatically by the echosounder system. To convert the recorded travel times into water depth, several sound velocity profiles were obtained with the shipboard CTD, providing a correction for ray bending for each beam. Depth is estimated from each beam by using the two-way travel time and the known beam angle known, and taking into account the ray bending due to refraction in the water column by sound speed variations. Combining phase and amplitude provides measurement accuracy practically independent of the beam pointing angle. Responsible person during this cruise / PI: Ingo Grevenmeyer (igrevemeyer@geomar.de) & Achim Kopf (akopf@marum.de) Chief Scientist: Achim Kopf (akopf@marum.de) CR: https://elib.suub.uni-bremen.de/ip/docs/ELibD1195_228.pdf CSR: https://www2.bsh.de/aktdat/dod/fahrtergebnis/2003/20050152.htm

Beschreibung: Underway temperature and salinity data was collected along the cruise track with two autonomous thermosalinograph (TSG) systems, each consisting of a SBE21 TSG together with a SBE38 Thermometer. Both systems worked independent from each other throughout the cruise. While temperature is taken at the water inlet in about 2.5 m depth, salinity is estimated within the interior TSG from conductivity and interior temperature. No correction against independent data was performed, neither for temperature nor for salinity. Finally, TSG1 was chosen for publication. For details to all processing steps see Data Processing Report.

Beschreibung: Upper-ocean velocities along the cruise track of Meteor cruise M170 were continuously collected by a vessel-mounted Teledyne RD Instruments 75 kHz Ocean Surveyor ADCP. The transducer was located at 5.0 m below the water line. The instrument was operated in narrowband mode with 8 m bins and a blanking distance of 4.0 m, while 100 bins were recorded using a pulse of 1.43 s. The ship's velocity was calculated from position fixes obtained by the Global Positioning System (GPS). Heading, pitch and roll data from the ship's gyro platforms and the navigation data were used by the data acquisition software VmDas internally to convert ADCP velocities into earth coordinates. Accuracy of the ADCP velocities mainly depends on the quality of the position fixes and the ship's heading data. Further errors stem from a misalignment of the transducer with the ship's centerline. Data post-processing included water track calibration of the misalignment angle ( -0.18° +/- 0.5601°) and scale factor (0.9992 +/- 0.0098) of the Ocean Surveyor signal. The average interval was set to 60 s.

Beschreibung: Seismic profiles p05 and p06 were shot during the cruise M115 of the German RV METEOR in the vicinity of the Mid-Cayman-Spreading-Centre off the median valley in flow line direction of seafloor spreading. Shots fired with a seismic airgun array (volume 5250 cubic-inch) towed behind the METEOR were recorded at Ocean-Bottom-Seismometers (OBS) and Ocean-Bottom-Hydrophones (OBH). Here, segy-data of all OBS and OBH providing data for geophysical data analyis are presented.