Lessons from Sea-Floor and Subsea-Floor Imagery of the Big’95 Debris Flow Scar and Deposit

Sea-floor (multibeam bathymetry, multibeam-derived backscattering, and side-scan sonar data) and subsea-floor (very-high-resolution seismic reflection profiles) imagery has been obtained in a series of surveys from the BIG’95 debris flow source area and deposit in the Ebro continental slope and rise, Northwestern Mediterranean sea. Side-scan sonar imagery provides valuable information on the morphology of the headwall scar, bathymetry and backscattering are useful for imaging the deposit, while seismics show the internal structure and relationship with the underlying sediments. Together with cores obtained in the area, the existing data set for the BIG’95 is a powerful tool for the study of the morphology and dynamics of debris flows and for their further modelisation.