Since precolonial times, low-magnitude seismic activity has been noted in southeastern Connecticut. South of Colchester, drill holes made in 1970 for roadcut blasting soon developed offsets that provide evidence for recently active thrust faulting. The sense of motion is that expected for deformation along the Honey Hill fault zone, a major east-trending zone of low-angle fractures. Repeated measurements taken over an 8-yr period indicate that creep continued along some fault planes after the initial movement. This motion is probably at least partly responsible for recurring tremors.

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