The SAT UHRS 2022-C4G campaign’s main aim was to perform the Sea Acceptance Tests (SAT) for the Ultra-High Resolution Seismics (UHRS) equipment acquired in December 2021.
The objectives of the campaign were to test the operation of:
– one 48-channel hydrophone cable (streamer) with a total length of 110 metres;
– two single-channel hydrophone cables (of 8 hydrophones) (mini-streamers) with 2.8 meters active section;
– acquisition systems dedicated to this equipment (Multitrace and Minitrace);
– one 75 metre high voltage (HV) cable.
The tests were successfully performed with the participation of IPMA’s technical team from the Marine Geology and GeoResources Division and a technician from Geosurveys, on board the research vessel Diplodus, south of Arrábida mountain range, between the 10th and 14th of May. The equipment was purchased through C4G – Co-Laboratory for Geosciences project funding, co-funded by the Foundation for Science and Technology. These systems allow vertical resolutions of the sediment record of ~10 cm in adequate environmental conditions (nature of the sediments) and penetration depths of 350 m. This system coupled with the sub-bottom profiler allows vertical resolutions of 5 cm and penetration depths of 5 metres. Together with the multibeam bathymetric surveys (Teledyne T50-P echo sounder), images of the seabed are obtained, allowing the detection of objects from 25 cm (at depths up to 30 metres).