MAPPEM Geophysics System / Package
MAPPEM
Towed marine electrical resistivity imaging system for subsurface geology imaging and buried-object detection, towed near the seabed at 3-4 knots.
Description
MAPPEM is a towed marine electrical resistivity imaging system for imaging subsurface geology and detecting buried objects. It is towed near the seafloor at about 3-4 knots; data reaches the crew in real time and is inverted into a true resistivity model of the subsoil with the FastInv algorithm. MAPPEM Geophysics says it is the only fully marine resistivity system on the market.
Key features
- Main tow fish (1.5 m long, 20 cm diameter) holding acquisition and control electronics
- Secondary tow fish with a current injection electrode: about 40 A (up to 100 A) every 0.5 second
- Receiving cable with 20 high-precision electrodes spaced 1 to 5 m; set-up length up to 120 m
- Depth of investigation between 10 and 40 m; accuracy of a few µV
- Deployable by two people from a small survey boat
- Images all geologies, including very hard rock and gas-bearing sediments
Applications
Geohazard and site investigation for MRE sites, cable routes, dredging and maritime infrastructure, plus buried object detection.
Specifications
| Tow speed | about 3-4 knots |
|---|---|
| Current injection | every 0.5 second |
| Current | about 40 A (up to 100A) |
| Receiving cable | 20 high-precision electrodes |
| Towfish dimensions | 1.5 m long, 20 cm in diameter |
| Set-up length | up to 120 m |
| Electrode spacing | between 1 and 5 m |
| Depth of investigation | between 10 and 40 m |
| Accuracy | a few µV |
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