Gareth Morris
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Research project
The working title of my PhD project is "Subsurface imaging using electrical tomographic methods". Induced polarisation (IP) is currently seeing a resurgence due to its increasing popularity in environmental geophysics. The subtle contrasts between environmental targets and their surroundings are close to the detection limits of modern systems and can easily be obscured by noise. To this end I have gone back to the basics of IP surveying to research ways of minimising system noise. I have performed studies on different electrode materials to assess the noise they introduce into survey data. Electrode charge-up effects can significantly affect phase-angle data and I have developed an algorithm that removes these effects from the voltage traces. The inversion programs that are often used to interpret IP data are becoming increasingly statistical in nature. The more sophisticated programs rely on estimates of data error to constrain the inversion. Through a series of synthetic surveys I have looked at the effect of misestimating this error on the inverted image. Part of this has involved the design and evaluation of measurement schemes in order to see which are the least affected by incorrect data error estimation.
My studentship is provided jointly by the BGS (British Geological Survey) and Lancaster University.
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- Gareth Morris
- Research Student
- Earth Science Systems
- Department of Environmental Science
- Faculty of Science and Technology
- Lancaster University
- Lancaster
- LA1 4YQ
- Tel: +44 (0)1524 593 534 [My office] Fax: +44 (0)1524 593985 [Dept. office]
- To email me, click here
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