People across the region felt a 3.8 magnitude earthquake that was centered off the coast of Maine in York Harbor. So how rare is such an occurrence in New England?

The Boston area shook from a rare, but minor, earthquake Monday morning. The U.S. Geological Survey rated the shaking as a magnitude 3.9, downgraded from the initial magnitude of 4.1. It was centered off the coast of New Hampshire and Maine in York Harbor, about 12 miles underground.

The U.S. Geological Survey recorded the quake as a 3.8-magnitude temblor that struck shortly before 10:30 a.m. ET. The epicenter was off the coast of York Harbor, Maine, roughly 45 miles southwest of Portland.