In January, eastern New England experienced a mild 3.8 shaker centered off York, Maine.
Eastern New England is a big crumple zone of old faults due to its history of tectonic collisions.
The Great Lakes are prone to intra-plate tectonic stresses as well as ground expansion as a result of the retreat of the Laurentide Glacier of the last ice age.
America is on the move, but not all pieces move at the same speed.