The day the earth moved

Norridgewock Town Manager John Doucette said Thursday's event sounded and felt like a dumpster had fallen off a truck or a truck had hit the town office building, but that nothing could be found when employees went outside to see what happened.

More than a mile away, Jeffrey McGown said he felt the shaking in his office. But he, too, couldn't find the cause. ''It felt like somebody with a delivery type of vehicle had backed into our building," McGown said.

Six miles away in Anson, the boom and shaking were so strong that off-duty dispatcher William Crawford called the county's dispatch center. He thought maybe his chimney collapsed or his furnace exploded, but he couldn't determine the cause, either.

State geologist Bob Marvinney of the Maine Geological Survey said if an earthquake occurred, it wasn't recorded by any of the instruments in Maine or elsewhere in New England.

Marvinney said he contacted the New England Seismic Network in Massachusetts, which hadn't picked up on any seismic activity in the area.

''I'm surprised we didn't pick up anything," he said. ''There are other kinds of explanations, like quarry work and roadwork."

Higgins said he checked with Guilford Industries to see if the company had been doing any quarry work, but was told there hadn't been any blasting since last fall. ''It's just unexplainable, I guess," he said.