Pelorus Surveys

Pelorus Surveys is experienced in a wide range of land geophysical survey techniques used as stand alone or in conjunction with intrusive site investigations.

Land Geophysics

Whether the location is a mountain top or an underground tunnel, a back garden or a sprawling brownfield site, our geophysical surveys provide valuable data to:

Rapidly assess sites
Optimise and target intrusive site investigations
Avoid unseen hazards
Provide continuous interpretation
Map underground features between isolated borehole locations.

Non intrusive geophysical methods can also be used to provide information where ground disturbance could be potentially harmful to people or the environment such as the search for Unexploded Ordnance (UXO) or mapping of contaminated land. All of our staff hold a CSCS card and individuals have specialised safety qualifications in confined spaces, Network Rail Personal Track Safety and London Underground Line access.

Geophysical Mapping Surveys

Pelorus Surveys' investigations are carried out by qualified and experienced geophysicists enabling on-site interpretation of the data. Surveys can then be adapted in the field to provide optimum results. Using the latest geophysical equipment to acquire data, survey results are positioned using high specification global navigation satellite systems.

Services	Applications
Seismic Surveys - Reflection - Refraction - Surface Wave	Geological Investigations/Rippability Estimates/Depth to Rockhead/Stiffness profiles
Magnetic field surveys - Base station - Gradiometer - Total field	Geological structures/service locations/mineshaft location/unexploded ordnance surveys
Electromagnetic surveys - Ground conductivity - Metal detection	Metal detection/unexploded ordnance surveys/ground conductivity mapping/buried valleys or river channel location
Electrical surveys - Resistivity mapping - Resistivity - Tomography - Vertical electrical sounding - Potential field mapping	2D geological profiles/depth to geological structure/land fill liner integrity survey/infilled quarry delineation
Microgravity surveys	Void Location
Ground Penetrating Radar surveys (GPR)	Concrete Assessment/Void Location/Animal Burrows/Slope Construction

Geophysical Down Hole Surveys

Pelorus Surveys is an industry leader in a range of seismic and magnetic methods for use in both down hole and cross hole modes. These techniques are used to assist in the design of foundations, detection of underground cavities, tunnelling operations and geological modelling.

Services	Applications
Cross hole seismic tomography	Identification of voids/geological features
Cross hole P and S wave velocity measurement	Small strain dynamic elastic modulus
Down hole P and S wave velocity measurement/Seismic cone penetration	Geological profiling/Seismic velocity determination/Small strain dynamic elastic modulus
Vertical seismic profiling	Pile length determination
Down hole magnetic surveys	Unexploded ordnance surveys/pile length determination
Small strain dynamic elastic modulus

Monitoring Surveys

Pelorus Surveys can carry out periodic monitoring surveys to enable assessments to be made on sensitive structures without drilling thus providing early warning of distress. Remediation can then be undertaken rather than reconstruction. The environmental impact of heavy traffic or machinery can be measured prior to installation of sensitive equipment or the impact on existing communities and surrounding buildings can be assessed. Monitoring schemes are always tailored to the specifics of the problem and can range from routine 'doorstep monitoring' of vibration to sophisticated packages involving state of the art equipment and data processing.

Services	Applications
Vibration monitoring	Impact of vibration on human activity/Structure response and damage probability/demolition/ quarry blasting/piling/vibrating machinery
Concrete integrity monitoring	Structure integrity/Concrete deterioration

Download Down Hole Land Geophysics as PDF

Download Surface Geophysics as PDF

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