Multi-channel seismic depth sections from RV Meteor expedition M113

The seismic data were collected during Expedition M113/1 aboard RV Meteor (Hübscher et al., 2016). The seismic source consisted of three GI- and one Mini-GI air pulser with a combined primary volume of 150 cubic inches, towed at a depth of 2.5 meters behind the vessel. The data were recorded using a 144-channel digital streamer, towed at the same depth. For more details about the marine reflection seismic method see Hübscher and Gohl (2016). Seismic data processing involved several steps, including frequency filtering (20-400 Hz), velocity analysis (every 50 CMPs), correction for spherical divergence and energy loss, normal moveout (NMO) correction, coherency filtering, stacking, migration, white noise removal, dip filtering, and fx-deconvolution. The main frequency is about 80 Hz, which results in a wavelength of 20 m (V=1600 m/s) to 25 m (V=2000 m/s). In the complex depositional environment, we estimate the vertical resolution to be no greater than half the wavelength. The depth conversion of the seafloor was performed using a seismic velocity of 1.5 km/s, which is accurate to within a few percent. For the depth conversion of the sedimentary cover, we applied an interval velocity increasing from 1.6 to 1.9 km/s from the seafloor to the lava flows, with an average velocity of 1.8 km/s. In order to estimate possible errors, we assumed a minimum and maximum average velocity of 1.6 and 2.0 km/s, so the velocity has an accuracy of ±11%. The TWT interval of the sediment package adjacent to the volcanic cones comprises approximately 0.5–0.6 km (Beier et al., 2022), corresponding to 0.4–0.6 km thickness. The data are discussed in: Hübscher, C., Friedrich, A., Preine, J., Beier, C., Hildenbrand, A., Nomikou, P., Terinha, P., Weiß, B., 2026. Seismic imagery from volcanoes on the Azores Plateau implies thatexplosive deep-water eruptions are more common than previously thought. Scientific Reports, 16:15066, https://doi.org/10.1038/s41598-026-53050-0 For questions contact Christian Hübscher ([e-mail]) References Beier, C., Genske, F., Hübscher, C., Haase, K. M., Bach, W., & Nomikou, P. (2022). The submarine Azores Plateau: Evidence for a waning mantle plume? Marine Geology, 451, 106858. Hübscher, C., Gohl, K. (2014). Reflection / Refraction Seismology. Encyclopedia of Marine Geosciences. doi.org/10.1007/978-94-007-6644-0_128-1128 Hübscher, C., Beier, C., Al‐Hseinat, M., Batista, L., Blum, M., Bobsin, M., et al. (2016). Azores Plateau–Cruise No. M113/1–December 29, 2014–January 22, 2015–Ponta Delgada (Portugal)–Ponta Delgada (Portugal), METEOR‐Berichte, DOI:10.2312/cr_m79_2 Hübscher, C. (2022). Seismic Reflection Data Over Azores Plateau, doi: 10.1594/ PANGAEA.943798. PANGAEA.