MAPPEM Geophysics System / Package
MAPPEM-S
Lighter version of the MAPPEM resistivity imaging system for very shallow water (about 0-10 m) surveys from small draft vessels.
Description
MAPPEM-S adapts the original MAPPEM resistivity imaging system for very shallow water, at about 0 to 10 m depth. It keeps the same capabilities and precision in a lighter package for small draft vessels, and is towed at the surface at about 3-4 knots to record substratum resistivity with real-time acquisition control.
Key features
- Water depth about 0 to 10 m
- Current injection of about 40 A every 0.5 second
- 20 measuring electrodes spaced 1 to 5 m
- Depth of investigation between 10 and 40 m; accuracy of a few µV
- First resistivity models available a few hours after acquisition
Applications
Imaging all geology types and detecting buried objects in very shallow nearshore areas; for example, a survey of about 250 km for a dredging company in the Middle East in 2019.
Specifications
| Water depth | about 0 to 10 m |
|---|---|
| Tow speed | about 3-4 knots |
| Current injection | every 0.5 second |
| Current | about 40 A |
| Receiving cable | 20 measuring electrodes |
| Electrode spacing | between 1 and 5 m |
| Depth of investigation | between 10 and 40 m |
| Accuracy | a few µV |
More from MAPPEM Geophysics
Featured products
All products →
Equipment
Hepworth 20Nm Pantograph Wiper
Compact 20Nm 12/24 V DC pantograph or pendulum marine wiper with arms and blades up to 610 mm.
System / Package
Supreme 12 VDC - 40 A
Automatic 12 V, 40 A battery charger with three independent outputs, programmable for AGM, GEL, wet and lithium, universal 90–265 VAC input; CE and ABYC compliant.
Equipment
8DZ DF genset
ABC 8DZ dual-fuel genset: medium-speed 8-cylinder inline engine running on natural gas (CNG or LNG) with diesel pilot ignition, or on diesel at any time; low-pressure gas supply up to about 500 mbar.