Revealing Hidden Subsurface Structures
The safe and cost-effective planning of construction and infrastructure projects requires reliable knowledge of subsurface conditions. One of the key challenges is identifying geological structures, cavities and other relevant features that cannot be investigated through boreholes alone or can only be detected at individual locations.
Geophysics uses indirect methods to obtain information about structures and physical properties beneath the Earth’s surface. These include gravimetric, seismic, (electro)magnetic and electrical methods. They enable the non-destructive investigation of the subsurface and embedded objects and the creation of an image of these structures. Geophysical investigations may, for example, measure variations in the Earth’s gravitational or magnetic field, analyse seismic waves generated by earthquakes and other vibrations, or determine mass distribution and electrical conductivity in deeper soil layers.
Geophysicists collect data in the field and use computer simulations and calculations to transform it into meaningful models of the subsurface. Through interdisciplinary collaboration with other specialists, these models are used to produce geological maps, site plans and profile sections.
Our Services
CDM Smith provides the expertise you need to safely guide your project through every stage of planning and construction. Whether geoelectrics, ground-penetrating radar, (electro)magnetics or seismic methods – our long-standing experience enables us to select the most appropriate technique from a wide range of options, design the investigation accordingly, and deliver robust, well-founded results on subsurface conditions or existing structures – quickly, reliably and cost-effectively.
Versatile Applications
Accurate subsurface investigations typically require calibration against direct exposures, such as boreholes. Geophysics helps significantly reduce drilling efforts by enabling more targeted placement of boreholes. As a result, geophysical methods are used across a broad range of applications – from environmental and infrastructure projects to hydraulic engineering, mineral exploration and structural assessments. At CDM Smith, our areas of work include: