Drone photomosaics of the seafloor at the shallow-water Milos hydrothermal system. Photomosaics were acquired with a Phantom and a Mavic Pro drone. Images were acquired in July and September 2019. Photomosaics are provided as geotiffs (UTM Zone 35).  

Seismic profile ST5-014 was acquired in May 2015 during the STEP 2015 cruise (DOI:10.17600/15006100) on the continental shelf offshore Nice Airport (SE France). The source was a 1200 J Sparker from Geo Marine Survey with electrical pulse on a 400 tip electrode. The seismic data were recorded on a Geo-sense 48-channel streamer of 230 m long with a trace spacing of 3.125 m which was towed at a depth of 0.6 m. One Automatic Identification System was deployed on the seismic source and two others on the head and tail of the streamer to ensure positioning with meter accuracy. The pre-processing of the seismic data included common midpoint binning, spherical divergence correction, 125-2500 Hz bandpass filtering, normal moveout correction and signature deconvolution. To preserve the high frequency content of the source only the first 24 traces were stacked (i.e. maximum offset of 80 m). This provided seismic data with a frequency range of 175 to 850 Hz. Detailed Root Mean Square velocity analyses were performed on super gathers every 1 m. After the picking of velocities on semblance panels, interval velocities were computed using the Dix equation. Stack and post-stack time migration were then applied using this velocity field. The time-migrated seismic data were converted to standard SEG-Y rev1 format (https://seg.org/Portals/0/SEG/News%20and%20Resources/Technical%20Standards/seg_y_rev1.pdf) with values written using “big-endian” byte ordering and IEEE floating-point. Seismic coordinates in trace headers are in WGS84 format and +DDDMMSS.ss unit (with a scale factor of -100).

This dataset contains seismic data from 17 OBS collected in the equatorial Atlantic Ocean during the SMARTIES cruise in 2019. 12 OBSs are located along the eastern Romanche transform and fracture zone, and 5 OBSs are located along the Mid-Atlantic Ridge. The OBS data are vertical components and recorded in MiniSEED format. The data collection started from 2019-07-20T00:00:00 to 2019-08-16T24:00:00. This dateset includes raw data from OBS #10 to OBS#19. OBS#15 recorded no data. Data from OBS#1 to OBS#9 are available from a companion dataset. OBS#8 was lost.

Multibeam bathymetry acquired by AUV Abyss (GEOMAR), during the ODEMAR Cruise off Les Saintes ilsnads (French Antilles). Data is processed and gridded at 2 m resolution.

The precise location and geometry of oceanic spreading centers and associated transform faults or discontinuities' boundary has fundamental implications in our understanding of oceanic accretion, the accommodation of deformation around rigid lithospheric blocks, and the distribution of magmatic and volcanic processes. The now widely used location of mid oceanic ridges worldwide, published by P. Bird in 2003, can be updated based on recent publicly available and published ship-based multibeam swath bathymetry data (100-m resolution or better), now available to ~25% of the ocean seafloor, but covering a significant proportion of the mid-ocean ridge system (>70%). Here we publish the MAPRIDGES database built under the coordination of CGMW (Commission for the Geological Map of the World), with a first version V1.0 (06/2024) that provides high resolution and up-to-date datasets of mid-ocean ridge segments and associated transform faults, and follow-up updates that will also include non-transform offsets. The detailed mapping of individual mid oceanic ridge segments was conducted using GMRT (Ryan et al., 2009) (version 4.2 for MAPRIDGES V1.0), other publicly available datasets (e.g., NCEI, Pangaea, AWI), and existing literature. MAPRIDGES will be revised with the acquisition of additional datasets, new publications, and correction of any errors in the database. The MAPRIDGE database was built in a GIS environment, where each feature holds several attributes specific to the dataset. We include three different georeferenced shapefile layers: 1) Ridge Segments, 2) Transform Faults, and 3) Transform Zones. The latest corresponds to zones of distributed strike-slip deformation that lack a well-defined fault localizing strain, but that are often treated as transform faults. 1) The Ridge Segments Layer contains 1461 segments with 9 attributes: - AREA_LOCA: The Name of the Ridge System - LOC_SHORT: The short form of the Ridge System using 3 characters - LAT: The maximum latitude of the ridge segment - LONG: the maximum longitude of the ridge segment - LENGTH: the length of the ridge segment in meters - CONFIDENCE: the degree of confidence on digitization based on the availability of high-resolution bathymetry data: 1 = low to medium confidence, 2 = high confidence - REFERENCES: supporting references used for the digitization - NAME_CODE: unique segment code constructed from the LOC_SHORT and LAT attributes in degree, minute, second coordinate format - NAME_LIT: name of the segment from the literature if it exists 2) The Transform Fault Layer contains 260 segments with 4 attributes: - NAME_TF: Name of the transform fault according to the literature - LENGTH: length of the transform fault in meters - LAT: The maximum latitude of the fault segment - LONG: the maximum longitude of the fault segment 3) The Transform Zone layer contains 10 segments with 4 attributes: - NAME_TF: Name of the transform zone according to the literature - LENGTH: length of the transform fault in meters - LAT: The maximum latitude of the fault segment - LONG: the maximum longitude of the fault segment To facilitate revisions and updates of the database, relevant information, corrections, or data could be sent to B. Sautter (benjamin.sautter@univ-ubs.fr) and J. Escartín (escartin@geologie.ens.fr).

The Capelinhos hydrothermal vent site is a large edifice of 588 m² from its base. Located off axis, 1.5 km east of the central lava lake of the main Lucky Strike Hydrothermal Vent Field (mLSHVF), it is characterised by distinct geochemical and thermal conditions from the others mLSHVF edifices, with notably high iron concentrations compared to sites around the lava lake. The edifice has been surveyed with the remotely operated vehicle Victor6000 for inter-annual monitoring during the 2023 Momarsat cruise. Video transects were collected during dive 844-6 with a forward-looking camera and video sequences were used to build 3D models of the edifice using structure-from-motion techniques. A first dataset includes 2971 images extracted every 2 seconds from the videos.  The images are time-stamped and linked to a navigation file, which is generated by interpolating navigation data at the corresponding timestamps. A second dataset includes a 3D textured model of the site (obj format) together with the a kml file for georeferencing. The ROV navigation file (.txt) is provided separately. Point :   37.28948183 (lat) -32.26413676 (long) -1663.487 (depth)

The Sintra hydrothermal vent site reconstructed in this dataset is 311.82 m². It is located in the North east of the main Lucky Strike Hydrothermal Vent Field (LSHF). The edifice has been surveyed with the remotely operated vehicle Victor6000 for inter-annual monitoring during the 2023 Momarsat cruise. Video transects were collected during dive 844-6 with a forward-looking camera and video sequences were used to build a 3D model of the edifice using structure-from-motion techniques. A first dataset includes 1561 images extracted every 2 seconds from the videos.  The images are time-stamped and linked to a navigation file, which is generated by interpolating navigation data at the corresponding timestamps. A second dataset includes a 3D textured model of the site (obj format) together with the a kml file for georeferencing. The ROV navigation file (.txt) is provided separately. Point :   37.2921244612 (lat) -32.2750499167 (long) -1612.34 (depth)

This dataset comprises multibeam bathymetry and very high resolution seismic data acquired over the Lansdowne Bank (New Caledonia, SW Pacific), during the SEDLAB cruise. The latter was a 29 day research cruise on the French national fleet ship R/V ALIS that took place in April and May 2018. The main aim was to characterise the sedimentary dynamics and the stratigraphic architecture of the Lansdowne Bank, a partly drowned, isolated rimmed carbonate platform of around 4000 km2 located offshore New Caledonia in the SW Pacific. More than 2000 km2 of new multibeam data, 7 single-channel SPARKER seismic profiles, along with 15 rock dredges and 8 sediment gravity cores were acquired on the bank top and adjacent slopes. These data reveal that the bank is typified by an almost continuous 4 km wide reef rim located in ca. 50 m water depth, showing typical “spurs and grooves” patterns. This outer rim surrounds a paleolagoon that gently deepens towards the inner platform, reaching up to 100 m water depth. Pinnacle reefs, up to 20 m high, are common close to the external reef rim, but are also scattered within the inner platform. Surprisingly, no obvious transfer axes across the reef rims, internal channels, tidal shoals or any clear current-related bedforms were imaged on the bank top. The bank is bordered by very steep slopes showing numerous bypass features such as canyons, channels and gullies. Additionally, spectacular bank margin collapses were identified. They are evidenced by up to 10 km wide intraslope and bank edge failure scarps, resulting in a scalloped geometry of the bank margin. Scarps are associated with km-sized blocks at the base-of-slope. Integration of all surface and subsurface data, together with post-cruise sedimentological, biostratigraphic and radiometric analyses on rock and sediment samples will hopefully bring new insight into the onset, aggradation and drowning history of the platform in relation to past sea-level changes and vertical tectonic movements. We believe that such results are relevant for the understanding of carbonate slope processes as well as platform-to-basin sediment budgets.

Extreme percentiles (1%, 5%, 95%, 99%) of bottom temperature and salinity, as well as (95%, 99%) of bottom currents, were modeled using SYMPHONIE on a numerical domain covering 65 × 60 km at a resolution of 80 m. The 10-m bathymetry used inside the Lacaze-Duthiers Canyon was collected during the CALADU_2021 cruise (https://doi.org/10.17600/18001575). Statistics of extreme values were derived from hourly fields simulated between November 1, 2012, and April 15, 2014. This period includes two contrasting winters: the winter of 2012–2013, which was cold with dense water cascading, and the winter of 2013–2014, which was warm. This dataset was produced to assess the probable distribution of habitats (habitat suitability modeling) for cold-water corals in the Lacaze-Duthiers Canyon at different resolutions as part of the European H2020 project REDRESS (Restoration of Deep-Sea Habitats to Rebuild European Seas, https://redress-project.eu/, Grant Agreement No. 101135492). SYMPHONIE is a component of the national service SIROCCO (research infrastructure ILICO). This dataset is related to the article "Mapping and Conservation of Cold-Water Corals in the Lacaze-Duthiers Canyon for Transboundary Management", submitted to Mediterranean Marine Science by Fabri et al. in 2025.

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