Geophysical Survey Consultancy

We offer international geophysical consultancy services for all types of site investigation, both on land and overwater. We do not acquire geophysical data ourselves as we are not a geophysical contractor; however, we work with carefully selected geophysical contractors.

To provide you with the best service, we provide consultancy services for geophysical site investigations. Unlike other geophysical service providers, we can assure you that we are totally independent of any geophysical contractors. As impartial geophysical consultants, we can provide you with totally unbiased and objective advice about the usefulness and benefits of geophysical ground investigation for your site. We are free to select the most appropriate geophysical contractor(s) in order to provide you with the highest-quality data possible and the most applicable results that best suit your needs. We do not acquire geophysical data ourselves but, depending on a client’s requirements, can engage suitably qualified specialist contractors to work to our survey designs and specifications and under our supervision, as appropriate. Alternatively, we can advise a client on technical specifications, selection of suitable contractors, tender assessment and evaluation.


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Our highly qualified staff are experienced in survey specification, processing, and interpretation of all common geophysical ground investigation methods, including:

  • Ground Penetrating Radar (GPR)
  • Electrical Resistivity Tomography (ERT) and Vertical Electrical Soundings (VES)
  • Induced Polarisation & Self-Potential techniques
  • Electro-Magnetic (EM) ground conductivity mapping (including airborne surveys)
  • Micro-gravity surveying
  • Magnetic single-sensor and gradiometric surveys
  • Radiometric surveys
  • Seismic reflection (single- and multi-channel, on land and overwater)
  • Hydrographic techniques (Multi-beam and dual-frequency echo sounders, side-scan sonar)
  • Seismic P- and S-wave refraction
  • Multi-channel Analysis of Surface Waves (MASW)
  • In-hole and cross-hole geophysical methods

With our associates we can also help you with your environmental and geotechnical queries.


Our approach to data analysis includes the collation of geophysical results with other geological, environmental, and geotechnical information, where appropriate, to produce a holistic and thorough interpretation. Deliverables can be generated in a range of formats, including ESRI ArcGIS products, and CAD drawings; other formats may be available.

Our personnel are experienced in the practical application and integration of geophysical techniques within the environmental, engineering, groundwater resources, and renewable energy sectors.

We can provide you with a very broad range of expert services:

  • Bespoke site investigation design and specification
  • Preparation of tender and contract documentation
  • Assistance with tender reviews
  • Independent contractor procurement
  • Contractor supervision on-site
  • On-site and office-based liaison with client representatives
  • Integration of borehole logs and geotechnical logs
  • Data processing and analysis
  • Data modelling
  • Fully integrated interpretation and reporting
  • Geotechnical and environmental verification
  • Expert witness
  • Technical training
  • Technical audits of third-party reports and datasets, including reprocessing and re-analysis of legacy geophysical data

For services for the offshore renewable energy and marine geohazards sectors please see our offshore wind farm geophysics pages.

All survey specifications for the surveys we design more than satisfy the technical requirements as set out in the Environment Agency Guidance notes (e.g. ‘Groundwater and Contaminated Land Project: Technical Aspects of Site Characterisation‘, Volume II (of IV) Text Supplements, by W. S. Atkins for the Environment Agency, HOCO 373, 2000); ASTM guidelines; and the Geological Society/CIRIA guidelines on ‘Geophysics in engineering investigations‘ (2002).



"CEGS have known of Reynolds International Ltd, previously Reynolds Geo-Sciences Ltd, since the mid-1990s and have utilised their services over the years for specific surveying in the former underground coal and iron ore fields of West Cumbria. As a lead consultant, we have used Reynolds International to successfully locate and define both the underground workings and the mine entries that pose a hazard to the built environment, especially shafts in the iron ore workings. Additionally, we have also enrolled on the CPD training courses that are organised by Professor John Reynolds and these provide an invaluable update to our professional skills. We will continue to use Reynolds International as our preferred specialist Geophysical consultancy because of the consistent high professional standards that are applied to every project."

Dennis R. E. Dickins, CEGS, Cumbria

"The British Embassy, Bucharest, has been working with Professor John Reynolds, of Reynolds International Ltd, since 2008 in order to ensure that the Embassy’s earthquake and emergency planning is up to date; and that all staff, dependents and the British community, for which the Embassy has a responsibility, are briefed on the causes, the preparations and the relevant actions in the event of an earthquake. Professors Reynolds’s knowledge, advice and guidance has been invaluable in ensuring that the embassy’s plan is as up to date and in an as workable format as possible. His knowledge is second to none and his guidance is clear concise and in an understandable format."

B A Davidson – HM Consul, Head of Corporate Services, Bucharest, Romania

"The earthquake preparedness training course provided by Professor John M. Reynolds for BAT Romania’ employees during 3 days in February this year was a well designed and tailored course given the high seismic hazard area where Romania is located. The main aim of the course was to provide our employees with necessary information to help them to reduce their own vulnerability at work, in their out-of-work activities and in their family lives. I was very pleased with the results of the training and, most importantly, I have received very positive feedback from participants. I recommend this course for other commercial organizations in Romania or abroad."

Eugen Stan, Business Security Manager