An earthquake that hit southern Maine has rattled nearby New England states as far as Connecticut, including the Boston area. The US Geological Survey at first estimated the Tuesday evening quake as a 4.6 magnitude, but later downgraded that to 4.0. It hit at about 7.12pm ET. The epicentre, about 3 miles west of Hollis Center, Maine, is about 3 miles deep. That’s about 20 miles west of Portland. The Maine emergency management agency had no immediate reports of damage or injuries.