In a recent article about deformation-band networks in Utah, Solum et al. (2010) present the thesis that deformation bands forming in the contractional regime are more areally extensive and not associated with discrete faults, whereas those forming in the extensional regime are generally limited to damage zones around faults. This is an attractive thesis and, insofar as it holds true, of great value for predicting deformation-band distributions in high-porosity sandstone reservoirs. We believe that Solum et al. (2010) touch on an important relationship between tectonic regime and strain distribution and, as geologists, we are constantly looking for simple relationships like...

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