The occurrence of pop-ups in the Québec City area

Abstract

Pop-ups, which form in response to high horizontal surface and near-surface stresses, were recognized on the floors of two quarries in metropolitan Québec City. This note constitutes the first published documentation of pop-ups in the Québec City area.The orientation of most of the pop-ups is consistent with the stress system affecting eastern North America; however, pop-ups with other orientations have also been recognized. The origin of the latter may reflect local stress conditions.