Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Poseidon	NORGEotech / POS472	27.07.2014 - 12.08.2014		Norwegian Sea

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Stegmann Sylvia	Universitat Bremen, Zentrum fur Marine Umweltwissenschaften	Trondheim	Troms?

Ziel der Reise / Objectives of Cruise:

Submarine landslides are a global phenomenon i) occurring in different physiographic settings (fjords, river deltas and fan, canyon systems, open continental slopes and volcanic flanks), ii) ranging in size from small-scale to large-scale features, iii) triggered by a variety of geological processes (e.g. seismicity, volcanic activity, intensive sedimentation, fluid flow) as well as anthropogenic activity on different scales of time (days to years). In that sense, submarine landslides, occasionally followed by tsunamis, represent a major geohazard and an exciting research target given the wealth of trigger mechanisms and their dynamic interaction. Cruise Pos472 is related to the investigation of stability and sediment deformation processes of shallow landslides in two different physiographic settings along the Norwegian margin. These include (i) coastal areas (Trondheim Harbour, Orkdalsfjorden) with intensive anthropogenic impact, and (ii) an open ocean setting (OOS) in intermediate water depth (Lofoten, Vesteralen). Main goal of Pos472 is to contribute to an ongoing Norwegian-German landslide collaborative study using static (GOST) and dynamic free-fall CPTu devices developed at MARUM for an efficient geotechnical in situ investigation. Particular focus is set on (i) the pore pressure characterization in coastal areas, where the occurrence of free gas in the sediment and pressure transients due to groundwater discharge along the slope prevail, and on (ii) the geotechnical characterisation of the slip plane of the OOS failure events (Lofoten, Vesteralen). Gravity core samples will be used for (i) pore water geochemical analyses to identify a contribution of fresh water, and for (ii) deformation tests to describe the mechanical behavior in general as well the susceptibility to creep. The findings will be incorporated into a multi-methodological landslide study in Norway (the so-called SEABED project run by NGI, NGU and Univ. Bergen), which is of high societal relevance due to the threat of landslides for the populated coastal zones as well as offshore industry infrastructure.

Messungen / Measurements