Kopf, A., Fleischmann, T., Gauchery, T., Meinecke, G., Renken, J., Spiesecke, U., Stange, N., Völker, D., von Wahl, T., Wenau, S., Wittauer, C. and Wu, T.-W. (2016) Report and preliminary results of R/V POSEIDON cruise POS500, LISA, Ligurian Slope AUV mapping, gravity coring and seismic reflection, Catania (Italy) – Malaga (Spain), 25.05.2016 – 09.06.2016. . Berichte, MARUM – Zentrum für Marine Umweltwissenschaften, Fachbereich Geowissenschaften, Universität Bremen, 312 . UNSPECIFIED, Bremen, Germany, 58 pp.

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Abstract

Cruise POS500 “LISA” with R/V Poseidon studied the western Ligurian Margin off
Southern France, an area in the northeastern part of the western Mediterranean Sea
characterized by its active tectonism and frequent mass wasting. The region near the Var
estuary close to the city of Nice is particularly suited for landslide research because it
represents a natural laboratority where it is possible to study a series of trigger processes of
geological and anthropogenic origin. The aim of this MARUM expedition was to:
i. Study fresh water seepage in the marine Nice airport landslide and adjacent stable
plateau in 15-50 m water depth using water sampling, CTD and geochemistry;
ii. Recover and deploy a number of observatories that monitor, pressure, temperature, tilt
and seismicity;
iii. Run an AUV micro-bathymetric survey with MARUM AUV SEAL5000 to
complement existing multibeam maps; and
iv. Acquire additional high-resolution seismic reflection profiles to unravel the complex
architecture of the Nice slope and Var delta.
In a period of approximately two weeks, we acquired valuable geophysical information that
helps to understand the evolution of this portion of the Ligurian Margin and further to
support an active Amphibious Drilling proposal submitted to ICDP and IODP. We could
also show that heavy spring rainfall plus melt water from the French Maritime Alps supplied
sufficient hydraulic forcing to push Var aquifer groundwaters to seep into the marine
deposits and water column. Freshening was strongest in the 1979 Nice landslide scar, but
was also found at the outer edge of the shelf. Recovery and redeployment of various
observatory prototypes worked well, both for the MARUM MeBo seafloor drillstring tolos
and independent piezometers.
Observatory data have yet to be evaluated. In addition, geochemical analyses of bottom
waters and pore waters was deferred to shore-based laboratorios except for salinity estimates
using a refractometer. Seismic processing was started onboard, but is largely taking place
post-cruise at University Bremen.

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