High-resolution mapping of large gas emitting mud volcanoes on the Egyptian continental margin (Nile Deep Sea Fan) by AUV surveys |
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| Authors: | S Dupré G Buffet J Mascle J-P Foucher S Gauger A Boetius C Marfia |
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| Institution: | (1) Ifremer, Géosciences Marines, Plouzané, France;(2) Géosciences Azur, Villefranche/Mer, France;(3) Fielax, Bremerhaven, Germany;(4) Max Planck Institute for Marine Microbiology, Bremen, Germany;(5) Ifremer/GENAVIR, La Seyne/Mer, France;(6) Marum, University of Bremen, Bremen, Germany |
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| Abstract: | Two highly active mud volcanoes located in 990–1,265 m water depths were mapped on the northern Egyptian continental slope
during the BIONIL expedition of R/V Meteor in October 2006. High-resolution swath bathymetry and backscatter imagery were
acquired with an autonomous underwater vehicle (AUV)-mounted multibeam echosounder, operating at a frequency of 200 kHz. Data
allowed for the construction of ~1 m pixel bathymetry and backscatter maps. The newly produced maps provide details of the
seabed morphology and texture, and insights into the formation of the two mud volcanoes. They also contain key indicators
on the distribution of seepage and its tectonic control. The acquisition of high-resolution seafloor bathymetry and acoustic
imagery maps with an AUV-mounted multibeam echosounder fills the gap in spatial scale between conventional multibeam data
collected from a surface vessel and in situ video observations made from a manned submersible or a remotely operating vehicle. |
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| Keywords: | Mud volcanoes Nile Deep Sea Fan AUV Bathymetry Backscatter Seafloor morphology Eastern Mediterranean |
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