Fig. 1: Geologic setting of the Peace River earthquake sequence. | Communications Earth & Environment

Fig. 1: Geologic setting of the Peace River earthquake sequence.

From: Bayesian inference elucidates fault-system anatomy and resurgent earthquakes induced by continuing saltwater disposal

Fig. 1

a Geologic setting of the Peace River earthquake sequence in western Canada (red box) and location of the MW 5.2 mainshock (red star). The sequence occurred near the eastern end of the Peace River Arch (PRA), an early Paleozoic emergent landmass surrounded by epicontinental seas and fringed by a Late Devonian reef system (Leduc Formation). The PRA collapsed in the Late Carboniferous, forming extensive grabens bounded by basement-rooted normal faults16,99. Several grabens are intersected by conjugate faults. The MW 5.4 Dawson Creek earthquake in 2001 (green star) was a natural event with a reverse source mechanism that reactivated a normal fault in the Precambrian basement4. b Simplified Paleozoic stratigraphy of the study region (arrows highlight SWD formations), with c generalized lithology100.

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