Multibeam echosounder (MBES) data recorded during RV MARIA S. MERIAN cruise MSM24 between 27.12.2012 and 21.01.2013 around Tristan da Cunha. The cruise MSM24 aimed to answer the question whether Tristan da Cunha classifies as a hot-spot with deep reaching asthenospheric anomalies and initiated the opening of the South Atlantic or whether Tristan da Cunha is a consequence of tectonic processes associated with more shallow anomalies. Another goal was to retrieve 26 ocean-bottom magnetotelluric stations (OBEM) and 22 broadband ocean-bottom seismometers (BBOBS) as well as two seismic and one magnetotelluric (MT) land stations from the uninhabited Nightingale Island. 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 RV MARIA S. MERIAN cruise MSM24 the Kongsberg EM122 multibeam echosounder with a nominal sounding frequency of 11.5 to 12.5 kHz was utilized. 288 beams (and up to 864 soundings in equidistant and dual swath mode) are formed for each ping with a 2°(Tx)/2°(Rx) footprint while the seafloor is detected using amplitude and phase information for each beam sounding. For further information consult https://www.km.kongsberg.com/. The tracks were planned parallel to the tracks of the MSM20/2 cruise due to the decision to receive bathymetric information about the area of the different BBOBS and OBEM stations. In addition, bathymetric gaps in-between the old survey area around Tristan da Cunha were closed. A general swath width of 55° was used wider swath widths were tested occasionally, however, the data quality decreased dramatically for the outer beams, most probably due to the high ship speed of 12 to 13 kn. Due to some problems with the graphic card the corresponding multibeam software broke down occasionally. Responsible person during this cruise: Irena Schulten.Chief Scientist: Wolfram H. GeisslerCR: https://www.tib.eu/de/suchen/id/awi%3Adoi~10.2312%252Fcr_msm24/CSR: https://www2.bsh.de/aktdat/dod/fahrtergebnis/2012/20130046.htmADCP: https://doi.pangaea.de/10.1594/PANGAEA.823160
