Deutsches Ozeanographisches
Datenzentrum Inventur der Poseidon-Reise POS500 (DOD-Ref-No.20160084)
Inventory of Poseidon Cruise POS500 (DOD-Ref-No.20160084)

Plattform
Platform
Reise-Nr.
Cruise-No.
Zeitraum
Period
Projekt
Project
Arbeitsgebiet
Working area
Poseidon POS500 25.05.2016 - 09.06.2016   Ligure Sea  

Fahrtleiter
Chief Scientist
Institut
Institute
Auslaufhafen
Port of departure
Einlaufhafen
Port of return
Stationskarte
Station map
Schiffsroute
Trackchart
Fleischmann Timo Universitat Bremen, Zentrum fur Marine Umweltwissenschaften Catania Malaga   

Ziel der Reise / Objectives of Cruise:

Expedition P500 LISA (Ligurian Slope AUV mapping, gravity coring and seismic reflection) aims to shed light on the controls of slope failure and submarine landslide processes at the Ligurian Margin in the proximity of the Nice international airport, southern France. The cruise was a follow-up project of several earlier expeditions in the same area (Kopf et al., 2008, 2009; Sultan et al., 2008) and put special focus on the acquisition of high-resolution geophysical data as well as additional coring to deepen the knowledge regarding the causes of the 1979 Nice airport landslide and tsunami. The proposal is further dedicated to support a recently submitted IODP (International Ocean Discovery Program) and ICDP (International Continental Drilling Project)amphibious drilling proposal (#796-ADP by Kopf et al., 2015) and test state-of-the-art technology for long-term monitoring. The Nice area represents an ideal natural laboratory, because a major landslide occurred in October 1979, which was well documented at the time and intensely studied thereafter. A combination of triggers was identified to have been responsible for catastrophic failure, and those triggers are currently monitored with shallow probes (<10 m below seafloor). Repeated research cruises led by MARUM Bremen or one of our French partners (IFREMER, Cerege) unraveled parts of the regional geology, in particular through Chirp surveys (Cerege) and MCS profiling (Bremen). To date, however, no high-resolution bathymetry is available for the neighbourhood of the proposed drill sites and the seafloor cable and node(s), so that we propose in the LISA cruise to carry out the following tasks: (i) detailed AUV bathymetric survey including subbottom profiling in the study area, (ii) additional high resolution MCS survey to image the delta sequences around the 1979 failure scar better, and (iii) additional gravity coring and bottom water sampling in strategic locations to acquire additional data and identify the effect of the Var aquifer in landslide triggering. Such data will be of utmost relevance to reiterate where (and when) submarine groundwater seepage is found and if/where active sediment deformation is currently taking place.

Messungen / Measurements

Institut
Institute
Wissenschaftler
Scientist
Anzahl
Number
Einheit
Unit
Typ der Messungen
Type of measurements
Kommentar
Comments
Daten im DOD
Data in DOD
MARUM Kopf Achim 41 cores G04
Core-soft bottom (no. of cores)
sediment cores for lithological description and pore water extraction. no
MARUM Kopf Achim 2 recovery G71
In-situ sea floor measurements
2 recoveries of long-term instruments for in situ measurement of seafloor P and T. no
MARUM Kopf Achim 68 tracks G76
Multichannel seismic reflection
68 profiles acquired. no
MARUM Kopf Achim 4 dm? H09
Water bottle stations
Niskin bottles. no
MARUM Kopf Achim 12 stations H10
CTD-Stations
CTD profile. no
9.11.2019