ALBERT

Description: Batyhmetry data based on the KONGSBERG Multibeam system EM120 was recorded during the RV SONNE cruise SO219A (Yokohama-Yokohama). The cruise took place between 08.03.2012 and 06.04.2012 in the Northwestern Pacific (Japan Trench) and was divided into two legs. The main research goal of the cruise was the investigation of the sedimentary fingerprint of the region caused by the 2011 Tohoku-Oki earthquake. Therefore the Remotely Operated Vehicle (ROV) QUEST (MARUM) was used to investigate fault zones and normal fault systems, which might co-seismically moved during the earthquake. Additionally slumps, seeps, and other structures , which might be related to the fault systems and therefore to the earth quake, were further explored using the ship-mounded hydroacoustic equipment (Multibeam and Parasound). 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 SONNE cruise SO219A the KONGSBERG EM120 multibeam echosounder with a nominal sounding frequency of 12 kHz was utilized. Up to 191 individual beams are formed for each ping while the seafloor is detected using amplitude and phase information for each beam sounding. The beams could have covered a swath width of 150° across track, however due to deficient data quality the maximum swath width during the cruise was only up to 120°/130°. For further information consult https://www.km.kongsberg.com/. Responsible person during this cruise / PI: Christian dos Santos Ferreira (cferreira@marum.de) Description of data processing: The open source software MB-System suite (Caress, D.W., and D.N. Chayes, MB-System Version 5.5, open source software distributed from the MBARI and L-DEO web sites, 2000-2012.) was utilized for this purpose. Roll corrections have been applied to the SO219A bathymetry data using a rollbias of -0.11. Using Mbeditviz, artefacts were cleaned manually. NetCDF (GMT) grids of the edited data as well as statistics were created with mbgrid. The published bathymetric grid of the cruise SO219A has a resolution of 100 m. No total propagated uncertainty (TPU) has been calculated to gather vertical or horizontal accuracy. A higher resolution is, at least partly, achievable. The grid extended with _num represents a raster dataset with the statistical number of beams/depths taken into account to create the depth of the cell. The extended _sd -grid contains the standard deviation for each cell. All grids produced are retrievable through the PANGAEA database (www.pangaea.de). Postprocessing and products were conducted by the Seafloor-Imaging & Mapping group of MARUM/FB5, responsible person: Paul Wintersteller (seafloor-imaging@marum.de). Projection: Geographic Coordinate System / WGS84 Chief Scientist: Prof. Dr. Gerold Wefer (gwefer@marum.de) CR: https://elib.suub.uni-bremen.de/edocs/00103574-1.pdf CSR: https://www2.bsh.de/aktdat/dod/fahrtergebnis/2012/20120100.htm, https://www2.bsh.de/aktdat/dod/fahrtergebnis/2012/20120101.htm Raw data: beim Upload der grids: Link zu den Rohdaten (wenn schon vorhanden) A special thanks goes to the following watchkepper during SO219A: Sato, Takeshi, Kanamatsu, Toshiya