The seismic surveys provide information about the structure of the sea floor, the depth and the nature of the different sediments, and the presence of buried objects. For seismic applications at sea, the most commonly used instrument is the “sub-bottom-profiler”.
It is able to report a sea floor profile with a definition of 30 cm, and a penetration up to 40 m. This data is very useful for: dragging, identifying the location of submerged structures, underwater archaeology, and geophysical surveys. Higher frequency systems are used in order to obtain greater resolution when deep penetration is not required.
CO.L.MAR. has 3 sub bottom profiler systems with different resolution, different frequency and different penetration in sediments, according to the purpose of the survey (low frequency and high penetration up to 40m or high frequency with high resolution, up to 1 cm definition)
Detection of rocky layer, evaluating volumes and type of material to be dredged, research of relict sands, buried target detection.
• Full spectrum CHIRP 4-24kHz, high resolution (40-80mm) penetration up to 40m in clay, digital acquisition in .JSF or SEG-Y format;
• Uniboom (300 joules energy source), good resolution (30cm), penetration up to 40m in medium density sediment, digital acquisition in SEG-Y format, 7+1 hydrophones array;
• Continuous Transmission Frequency Modulation 10-30kHz, very high resolution, (up to 10mm), low penetration
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