An earthquake centered off the coast of New England Monday morning was felt in the Boston area, Maine and Pennsylvania.

Monday’s incident marked the strongest earthquake in the northeast U.S. since last year when a 4.8-magnitude earthquake hit New Jersey in April — the strongest to hit the region in more than a decade, according to NBC News. There is currently no tsunami threat in New England, according to the U.S. Tsunami Warning Center.

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?