Marine Geophysics Services
Using any vessel of opportunity Surrich can carry out a diverse range of Geophysical surveys. A wide range of Geophysical equipment can be mobilised on to a vessel and provide the client with the desired Sub-bottom datasets.
Marine Geophysical Techniques
These techniques allow the survey team to quantitatively observe the physical properties of the earth below the seabed.
Surrich can carry out the following geophysical techniques:
Marine refraction provides compressional seismic velocities below the seabed.
Higher velocities typically denotes a more denser material.
Marine refraction is an invaluable tool for:
• Pre dredge surveys.
• Offshore/nearshore construction.
• Bedrock mapping.
• Geotechnical surveys.
Reflection surveys determine the layering that occurs below the seabed. When the density of the seabed substrate changes some of the energy from the acoustic pulse that is generated from the sound source is reflected back to the hydrophones. This signal is time stamped throughout the entire sampling period creating a graphical representation of the geological structure below the seabed.
Marine resistivity surveys measure changes in the electrical resistivity of the structure below the seafloor by applying small electric currents across arrays of electrodes.
The data is processed to produce graphical depth sections of the thickness and resistivity of subsurface layers.
This technique is beneficial in determining the density of the material below the seabed.
Magnetometer Surveys are carried to located ferrous object on the seafloor and below.
Applications magnetometer surveys are utilised for:
- Archaeology
- Engineering studies
- Geological studies
- UXO
- Search and recovery of submerged objects.
