During the Fluid3D campaign (november 2018, R/V L’Europe), a new investigation of both seafloor morphology and water column was done between 10 and 300 m water depth in the frame of the MODAL project by using the ME70 and EM2040 multibeam systems. New DTMs with a horizontal resolution of 2 to 1 m were made.
They will complete the time series (1999-2006-2011) already available and will highlight the submarine landslides that could have triggered since very recent time. But one of the main result of the campaign is the identification of acoustic anomalies within the water column. These anomalies look like vertical flares that extend from the seafloor up to tens of meters. The flares are interpreted as fluid expulsion. A few fresh water seepages were already identified within the scar of the 1979 landslide, and the mapping of the newly identified flares will provide a unique observation of the extension of the fluid-expulsion activity at the scale of the whole studied area.