Abstract
An estimation of the thickness of the lava beds of East Lothian and adjacent areas has been attempted based on aeromagnetic modelling. The produced three-dimensional model which takes into account the known thickness of the volcanics in the Spilmersford borehole, suggests a maximum thickness of nearly 600 m occurring few kilometres offshore, southwest of Aberlady. It was found that the magnetization contrast, which would result in a model consistent with the Spilmersford borehole information, was 4 A/m. This value is within the limits of the susceptibility variation of hand sample measurements of sills from the coastal areas of East Lothian. Subsequently, the maximum gravity effect of this model was calculated and then it was substracted from the original Bouguer gravity anomaly map of the area. The finally produced stripped gravity map shows enhanced the effect of the main geological formations of that region. The significant conclusions that can be derived for the crustal structure there, such as the probable continuation of the Midlothian and Leven Coalfield under Firth of Forth, are discussed.
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