Geophysical Systems
Geophysical Systems
CRA has been using marine magnetometers, side scan sonars and sub-bottom profilers since the company’s inception in 1987.
CRA owns an Edgetech 4125 ultra high resolution portable side scan sonar system. Side scan sonars are used to capture underwater images of seafloors and river bottoms. This type of survey is useful in search and recovery efforts, determining the amount of debris within an area of interest. The side scan images are exported as geo-referenced files allowing us to provide clients with coordinates and sizes of any objects of interest.
The magnetometer owned and operated by CRA is a Marine Magnetics unit. Magnetometers are useful in locating unexploded ordinances, and relatively shallow buried pipelines. It can also be used to determine if any buried debris exists within a new construction project area.
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The choice of sub-bottom profiler depends largely on the objective of the survey. Pingers and Chirps are higher frequency, higher resolution, but lower penetration. Boomers and then sparkers go lower in frequency and higher in power. The former are used to see unconsolidated sediment over rock or to find pipelines. The latter are more geological tools to see further down into the sedimentary sequence. Processing and interpretation are done in Chesapeake Technologies SonarWhizMap, and then the results brought into CAD for final charting.
Our extensive experience with geophysical systems on a multitude of various projects allows us to identify which survey system will provide our clients with the information necessary to successfully complete any project.