STATS GeophysicalPorterswood House

Porters WoodSt Albans, Herts

AL3 6PQ

INTRODUCTION

To discuss the benefits of a well designed and executed geophysical survey contact STATS Geophysical.We can discuss in We are happy to advise on principles and

techniques, and provide courses and seminars on geophysical theory and applications.general terms, or for a specific site.

Page 2

The deployment of the latest equipment,coupled with the field application of thelatest processing and visualisation softwarecan provide key information not availablethrough other means.

Geophysical surveying techniques providea toolbox of rapid, discrete and costeffective methods for the location andidentification of subsurface features.

STATS Geophysical provide consultancy, surveydesign and site investigation services. Weroutinely apply state of the art geophysicalinstrumentation to the identification ofsubsurface features associated with man-madeand natural phenomena. Our senior staff haveinternational research profiles through their workin geophysical data collection and interpretation,with work ongoing into new equipment and dataprocessing software.

The use of geophysical surveying

GEOPHYSICAL

ContactGeorge Tuckwell on: www.stats.co.uk/

geophysics01727 798643

geophysics@stats.co.uk

STATS GeophysicalPorterswood House

Porters WoodSt Albans, Herts

AL3 6PQ

Page 3

Geophysical techniques

Geophysical surveying may be used to pinpoint locations within a site totarget with conventional intrusive investigation, but by the same tokenmay be deployed to eliminate the need for the disruption caused byboreholes, trial pits, cores or breakouts.

In each case the appropriate geophysical technique must be used in thecorrect survey manner in order to maximise the ability of the survey toyield clear results. Surveys should be designed and undertaken byqualified and experienced geophysical professionals, and should makefull use of available instrumentation and software to provide the bestpossible interpretation in a timely and efficient manner.

Rapid data collection

Deploying the latest survey equipment and software tosite can minimise the time from arrival on site to thevisualisation of survey data. Careful survey design,tailored to the target and to the environment, can avoidthe collection of unnecessary data, and can alsoprevent inconclusive or misleading interpretations.

Data processing and reporting

Data should be quality checked on site as part of the datacollection methodology, and also checked at the end ofeach site visit by the lead geophysicist. Often initialindications from the raw un-processed data can inform theongoing data collection phase of the project. In somecases data can be transmitted back to the office to providethe client with early interpretations.

The collection of good field data is only half of the picture.Careful processing of the data must be undertaken by anexperienced geophysicist in order to produce accurateinterpretations, and in order to avoid the misinterpretationof spurious signals in the data. It can take several days toprocess the data collected during one day in the field.

In every case the objective is to integrate the geophysicaldata intelligently with all other relevant site information, andproduce an accurate interpretation that providesinformation that the client needs.

GEOPHYSICAL

Data Collection and Visualisation

The latest data interpretation and visualisationsoftware can be used in real time in the field. Whencoupled with the use of differential GPS for datalocation, delivering positional accuracy better than0.25m, the software can eliminate the need to breakthe survey down into a number of rectilinear sub-areas, further improving the efficiency of data

Integrated Surveys

Multiple geophysical data types can all be collected inthis manner at walking pace, or at greater speeds iftowed on a mobile instrument platform. In many casesthe collection of more than one type of geophysicaldata provides significantly more information than asingle survey, therefore the rapid and efficientcollection of data is imperative.

Read more about the various geophysicaltechniques in the following chapter.

INTRODUCTION

STATS staff possess both commercial and researchexperience in geophysical data processing