P. Owen writes:
I read with interest the recent paper by Evans et al. (2002) on the subject of the Pennine Anticline. In the paper the authors seek to establish that the Pennine Anticline is ‘underlain by a high angle reverse fault at basement level’.
The basis of this conclusion is provided by three seismic profiles (Evans et al. 2002, figs 5–7), since gravity data are necessarily ambiguous, and such a fault has not been mapped at the surface. Seismic reflections from steeply dipping interfaces are very difficult to image correctly – a high angle fault plane (dipping...
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