Stockholm university
Department of Geological Sciences

Marine geophysical mapping

High resolution geophysical equipment (sonars)

  • 24 kHz Single beam Sub-bottom profiler (pinger), Portable
     
  • 2–9 kHz Sub-bottom profiler (pinger), Dual transducers
     
  • Sub-bottom profiler(tow fish)
    Edgetech SB-0512 Sub-bottom profiler
    Portable (on pallet, 204 kg)
    Frequency Range: 500 Hz–12 kHz
    Vertical Resolution (depends on pulse selected) 8–20 cm
    Penetration (typical) in clay: 200 m
    Weight in Water: 68 kg
    www.edgetech.com
     
  • Edgetech SB-216 Sub-bottom profiler
    Portable (76 kg)
    Frequency Range: 2–16 kHz
    Vertical Resolution (depends on pulse selected): 6–10 cm
    Penetration (typical) in clay: 80 metersWeight in Water: 32 kg
    www.edgetech.com
     
  • Kongsberg EA600 Single Beam Echo sounder, Hull-mounted on R/V Skidbladne
     
  • illustration of icebreaker Oden and the multibeam sonar system
    Kongsberg EM122 (1x1°) – Multibeam sonar
    Hull-mounted on Icebreaker Oden
    Depth range: 20 to 11000 m
    Frequency: 12 kHz (chirp mode and dual swath capability)
    Swath width: 4–5 times the water depth
    Beam width: 150°x1°
    Beams: 288 beams covering a sector up to 150°
    www.km.kongsberg.com
     
  • view from the side of research vessel Skidbladner
    R/V Skidbladner in mapping action with both the bow-mounted EM2040 (200-400 kHz) and side-mounted EA600 (15 kHz) sub-bottom profiler in the water.
    Kongsberg EM2040 (1°) – Multibeam sonar
    Mounted on R/V Skidbladner, but is portable
    Depth range: 0.5 to 600 m
    Frequency: 200–400 kHz
    Swath width: max 750 m
    Beam width: 140° x 0.7°
    Note: well suited for surveys meeting the IHO-S44 special order requirements.
    www.km.kongsberg.com
    Bow mount of EM2040 on R/V Skidbladner. The GPS on photo are two Hemisphere A101 for heading and one center-mounted Hemisphere R320 (RTK GPS/Glonass) for positioning. In 2015 the positioning system was upgraded to a Seapath 320+. An MRU5+ is mounted on the transducer casing in a subsea bottle.

     
  • computer images of sediment profile drift along the Amundsen Sea slope, West Antarctica
    Kongsberg SBP120 (3°) – Chirp sonar (sub-bottom profiler)
    Hull-mounted on Icebreaker Oden
    Depth range: 20 to 11000 m
    Frequency range: 3–7 kHz, chirp
    Vertical resolution: 0.35 ms
    Horizontal resolution: 3°x3°
    Integrated with EM120 by using the same receiving transducer array
    www.km.kongsberg.com
     
  • L-3 Klein 3000 Digital Side Scan Sonar
    Portable
    Depth Range: 600/150 m (operating depth down to 1500 m)
    Frequency: 100/500 kHz
    Swath width: max 750 m
    Beam width: 0.7°/0.21°
    www.l-3mps.com/klein/pdfs/Klein_System_3000.pdf
     
  • Oden Multibeam and Chirp Sonar System
    Please see information about Oden Multibeam and Chirp Sonar System under Marine platforms page.
     
  • computer screen showing gas seeps from continental slope off western Greenland
    Screen capture showing gas seeps from continental slope off western Greenland. Disturbances are from additional echo sounder.
    SIMRAD EK60 – Scientific echo sounder for water column data/fish tracking
    Installed on icebreaker Oden
    Frequency: 18 kHz (possible additional frequencies 18-710 kHz)
    Beam width: 20x7° (140°)
    Depth range: Full ocean depth
    www.simrad.com

     

  • two images of small black boxes
    Seapath 320 GPS/GLONASS including MRU5
    Installed on Icebreaker Oden
    Heading accuracy: 0.05 RMS (4 m baseline)
    Roll and pitch accuracy: 0.03 RMS for ±5° amplitude.
    Heave accuracy: 5 cm or 5% whichever is highest
    Positioning accuracy: (best case) 0.15 m RMS or 0.4 m (95% CEP)
    www.km.kongsberg.com

    the front of a small research vessel with a MRU5+ installed
    MRU5+ plus installed in a subsea bottle mounted on the top side of the EM2040 transducer casing. The EM2040 bow-mounted system on R/V Skidbladner is here shown in transport mode, hoisted up on deck. In 2015, the positioning system was changed to the Seapath 330+ including new GPS/GLONASS antennas shown in the photo below. The subsea bottle was also changed to a newer version. The antenna separation has been increased from 1.5 to 2 m.
    the front of a small research vessel with a MRU5+ installed
    MRU5+ plus installed in a subsea bottle mounted on the top side of the EM2040 transducer casing. The EM2040 bow-mounted system on R/V Skidbladner is here shown in transport mode, hoisted up on deck. In 2015, the positioning system was changed to the Seapath 330+ including new GPS/GLONASS antennas shown in the photo below. The subsea bottle was also changed to a newer version. The antenna separation has been increased from 1.5 to 2 m.

     

Single-channel seismic equipment

  • 2 Bauer Air compressors, Portable (on pallets)
  • 2 Bolt Pneumatic Air Release (PAR) airgun, Portable 1500 cubic inches with amplifier
  • 2x20 m Hydrophone streamer, Portable (on pallets)100 hydrophone elements each
  • 3 Reavell Compair Air compressors, Portable (on pallets)
  • Bolt 600 Pneumatic Air Release (PAR) airgun
    Portable
    1–40 cubic inches with amplifier
    Frequency range: 20–500 Hz
    Towing depth: 1 to 2 meters
    Pulse duration: 10 msec typical
  • Digital recording units, Portable

Other geophysical equipment

  • Geometrics G-880 marine magnetometer
    Portable
    Measured Quantity: Total Magnetic field in nT at 1sec sample interval
    Operating Principle: Self Oscillating split beam Optically pumped Caesium Vapor cell (non-radioactive)
    Heading Error: < +/- 0.5nT over entire 360° range
    Absolute Accuracy: ±2nT throughout range
    Operating Range: 20,000nT to 100,000nT
    Pressure Rating: 2000 psi (approx 1300 metres)
    Operating Zones: The earth’s field vector should be > 6° away from the sensor’s equator and > 6° away from the sensor’s long axis. Automatic hemisphere switching.
    www.oceanscan.ne

     
    marine magnetometer, looks like a white stick

Last updated: August 15, 2022

Source: Institutionen för geologiska vetenskaper

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