Marine seismic is a tool used for acoustic imaging of geological layers and widely used from oil exploration of deep offshore reservoirs, to the study of near-shore sedimentary processes.
Very High Resolution surface seismic is adapted to coastal areas.
It provides for seismic surveys in less than 100 m of water, imaging the sediments over a few tens of meters thick with a metric resolution. This method is particularly used on coastal vessels for geotechnical studies or the assessment of mineral resources such as sand stock assessment.
Sparker is a Very High Resolution seismic source widely used by academic research and companies conducting site studies for more than 30 years. The Sparker source consists of a high-voltage electrical discharge in a electrode towed just below the water surface.
To meet the need to improve resolution and penetration capacities requested by the scientific users, an applied research project began in 2013, between the Institut Carnot - Ifremer EDROME and the company SIG
New experimenting took place at the Brest test basin in April 2014 and at sea aboard the N/O Thalia vessel in May 2014 (Sisplateau campaign): electrical, acoustic and video signals using a fast camera of 50,000 frames/second. All the measurements acquired in the basin and at sea will make it possible to better qualify the nature of the Sparker signal and to propose technological research axes to improve its resolution.