The Universidad Federal of Bahia (Brazil) has collected high resolution data using the multimode Meridata acquisition system, with a SIG Pulse S1 driving sparker & boomer sound sources. In the region of Todos os Santos Bay, a bridge connecting the city of Salvador to the Island of Itaparica is planned to be built. Before planning and performing engineering works, the geophysical investigations are essential for the stratigraphic mapping of the area. It was important to identify the top of the rocky substrate and the thickness of the recent sedimentary cover. The shallow marine reflection seismics was ideal to map the sequences of the Quaternary sediments. The rocky basement (Recõncavo Basin) was mapped also.
Isaac de Oliveira Santos1 , José Maria Landim Dominguez1 (2019) ,Mapeamento estratigráfico utilizando sísmica de alta resolução no trecho da futura Ponte Salvador-Itaparica, Bahia, Brasil, Geol.
USP, Sér. cient., São Paulo, v. 19, n. 4, p. 8-98, Dezembro 2019
High-resolution seismic records totaling 180 km were acquired using the Meridata Multi-Mode System, with a SIG Pulse S1 and boomer acoustic source operating within a frequency spectrum of 0.3 to 1.5 kHz and power between 80 and 140 J.
The new vessel of the JCG will be equipped with SIG multi-channel streamers. The first streamer delivered to JCG is already on board the R/V Shoyo, operated by the Hydrographic & Oceanographic dept of JCG.
Two other survey vessel are under construction for deployment in 2019 and 2020, both with shallow water sounding equipment installed. Toyo Corporation, SIG's rep in Japan is promoting the MC streamers. The units of JCG have 24 channels, spaced at 2.5 m with a total active section of 96 m.
"Seismic data were collected using a Boomer-type seismic source operating at 300J on the continental shelf of the Potiguar Basin near the municipality of Macau-RN, Brazil.
Two incised valleys were identified one whose maximum incision depth reaches 56 meters and the filling thickness is around 26.5 meters; and the second valley with maximum depth of incision reaching 76 meters, and filling thickness around 41 meters."
The Shanghai Shenfeng Institute of Novel Geological Techniques Co. Ltd has taken possession of their new boomer SIG Pulse M2, and reported the first tests on the Yangtze River. Exceptionnal penetration at 90 ms TWT, even in the very shallow zone of 5 m water depth. The boomer was operated from a barge-type boat. The size of the system allows the operation from such small vessels. Training and tests at sea have been performed by the technical staff of Geo Marine Technology Ltd, Chinese agent for SIG France since 2007.
The Shenfeng Institute has a main business in applied geophysics : like seismic prospecting for oil and gas, minerals, active faults investigations, river bottoms subsidence, integrated geophysical survey for site or route of major construction projects on land and water, etc...