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.

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 #1 to OBS#9. OBS#8 was lost. Data from OBS#10 to OBS#19 are available from a companion dataset. OBS#15 recorded no data.

Videos recorded during the SMARTIES cruise with the Nautile cameras (fixed and mobile) during dives along the axial domain of the Mid-Atlantic Ridge south of Romanche transform fault. The following dives are part of this datatset: - SMA-1970 - SMA-1973 - SMA-1974 - SMA-1975 - SMA-1976 - SMA-1977 - SMA-1978 - SMA-1979 - SMA-1980 These videos illustrate different volcanic structures along the neo-volcanic zone of the ridge axis. The dives explored two non-transform discontinuities and two ridge segments between Romanche and Chain transform faults (RC-2 and RC-3). Dives SMA-1970 , SMA-1976 and SMA-1980 explored volcanic formations inside a large non-transform discontinuity between segments RC-1 and RC-2. Dive SMA-1978 explored the floor of the discontinuity between segments RC-2 and RC-3. Dives SMA-1973, SMA-1974, SMA-1975 and SMA-1979 explored different parts of the neo-volcanic ridge of segment RC-2. Dive SMA-1977 explored volcanic formations in the northern part of segment RC-3. The detailed study of these videos were published in Grenet et al., 2023 associated paper.

Gridded shipboard multibeam bathymetry and backscatter mosaics along the axis of the Mid-Atlantic Ridge. The used data are part of the dataset acquired during the SMARTIES cruise (2019). The gridded datasets cover different portions of the axis of the Mid-Atlantic Ridge south of the Romanche transform fault. Bathymetry grids format: nf = GMT netCDF format (32-bit float), CF-1.7 area NTD1_W grid information: x_min: -16.8647 x_max: -16.716917313 x_inc: 0.000180003272838 name: x n_columns: 822 y_min: -0.0246146868 y_max: 0.0418 y_inc: 0.000179985601084 name: y n_rows: 370 area NTD1_E grid information: x_min: -16.6878 x_max: -16.6098585829 x_inc: 0.000180003272748 name: x n_columns: 434 y_min: -0.0313156947 y_max: 0.0225 y_inc: 0.000179985601003 name: y n_rows: 300 area RC2 grid information: x_min: -16.5302 x_max: -16.3748571756 x_inc: 0.000180003272769 name: x n_columns: 864 y_min: -0.2029041037 y_max: -0.0042 y_inc: 0.000179985601178 name: y n_rows: 1105 area NTD2 grid information: x_min: -16.29 x_max: -16.183078056 x_inc: 0.000180003272727 name: x n_columns: 595 y_min: -0.2707547876 y_max: -0.2056 y_inc: 0.000179985601105 name: y n_rows: 363 area RC3 grid information: x_min: -16.1522 x_max: -16.065078416 x_inc: 0.000180003272727 name: x n_columns: 485 y_min: -0.3490268035 y_max: -0.30907 y_inc: 0.000179985601351 name: y n_rows: 223  

Ages obtained through the 40Ar/39Ar method for basalt samples with the Nautile submersible along the axis of the Mid-Atlantic Ridge south of the Romanche transform fault. Major elements measurements were performed on the same samples. For a complete description of the method and discussion of results, please refer to the Grenet et al. 2023 article.