MARINE SERVICES :: MARINE GEOPHYSICAL INVESTIGATIONS Marine geophysical investigations document underwater geology, providing a direct cost benefit to design and construction projects, dredge planning, habitat mapping, cultural resource surveys, submerged pipeline and cable location surveys, and search and recovery missions. To meet these objectives, DEA Marine Services provides sub-bottom profiling, seismic profiling, side scan sonar imaging, underwater acoustic scanning and imaging, marine magnetometer surveying, and tone induction tracking of pipelines and cables as part of our geophysical services. Sub-bottom profiling surveys map underwater subsurface geology using 3.5 to 24 kHz frequency profilers as well as seismic reflection or refraction technology. Ground penetrating radar (GPR) is also available for use in freshwater and other non-conductive environments. Side scan sonar imaging surveys map underwater features, providing an acoustically generated image that can be used to characterize seafloor or riverbed features, identify obstructions projecting above the bottom that would impede or threaten navigation or construction, delineate bottom materials, or aid in search and recovery missions. Magnetometer surveys measure the ambient magnetic field and can locate concentrated masses of ferrous material. These surveys are often used to locate ship anchors or buried pipelines, or to investigate proposed cable and pipeline routes for the presence of cultural features. More Key Contacts :: Related Projects Marine Services Navigation and Nautical Charting Infrastructure Inspection Marine Design and Construction Support Flood Control and Reservoir Capacity Studies Environmental Investigations Marine Geophysical Investigations Geospatial Analysis Mobile Vessel Laser Scanning Hydrographic Surveys Marine Services Projects Who We Are History Core Ideology Leadership Stewardship Locations Contact DEA What We Do Energy Land Development Transportation Water and Environment Surveying and Geomatics Marine Services Solutions Alternative Project Delivery Construction Engineering Energy Development Engineering Landscape Architecture Environmental Planning and Compliance Planning Project Management News Awards Rankings Join Us Our People Current Openings Benefits Subconsultants and Vendors David Evans and Associates, Inc., 2100 S. River Parkway, Suite 100, Portland, OR 97201 :: 800.721.1916 Copyright © 1996-2021 David Evans and Associates, Inc. All rights reserved. :: Terms of Use | Privacy Policy