The world stress map (Zoback, 1992) shows almost ubiquitous anisotropic stress regimes attributable to varying and long-lived global tectonic stresses. It is highly improbable that (1) an isotropic stress state existed anywhere in the Earth's upper crust prior to 2 Ma and (2) the conclusion by Grollimund and Zoback (2003) of no pre-ice cap tectonic stresses in the north Viking Graben is based on an oversimplified model and rather selective, limited data.

Grollimund and Zoback (2003) stated that the thick Pleistocene glacial ice overburden had a strong impact on the fault-seal integrity in oil and gas reservoirs at...

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