The U.S. Geological Survey reported a 4.7 earthquake 136 miles off the coast of Ocean City early Tuesday night.
The quake hit around 6:30 p.m., and occurred just over 6 miles deep.
State geologists said Wednesday that they believe an underwater landslide or “reactivation” of an ancient fault might have triggered it, but that they had not confirmed the cause.
A firefighter in Ocean City said he had not felt any tremors or related calls for service Tuesday. But...