The observed vertical movements of the ground near Lac St. Jean, Quebec imply, if real, a fairly deep-seated driving mechanism and a localized area of low shear strength in the near surface layers. An analysis of the observation by means of body force equivalent theory also rules out the existence of localized fault slip and suggests a degree of structural control.This work is an application of an interpretation technique developed for the study of permanent changes near earthquakes. The limited conclusions are a consequence of the limited data available.

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