It may have been small — 1.3 on the Richter magnitude scale — but it was enough to startle Midcoast early risers Sept. 14, and had them talking, with reports of a loud bang and a small tremor felt in several towns.

The epicenter, according to the U.S. Geological Survey, was in Lincolnville, on the southern side of Pitcher Pond, 4.5 miles down into the earth. The coordinates were 44.327°N, 69.030°W, with leeway of 1.4 miles and depth of plus or minus 3.1 miles. According to the map provided by the Survey, the spot was in a little stand of woods near cottages on the southwest side of the pond, between fire roads Fourth Avenue and Fifth Avenue.

The earthquake occurred at 5:59 a.m, and a number of residents in Lincolnville, Camden and Rockport reported hearing and feeling an explosion or a boom, while others described it as sounding like a large truck backfiring or rumbling by. Some said their windows rattled, others said their dogs growled before it happened. Facebook filled with wisecracks, attributing the cause to the New York special election or a local official dropping weights.

Several reports of the event were received by local police departments.

A seismologist, using monitoring data collected at the Weston Observatory of Boston College, part of the New England Seismic Network, eventually concluded later in the day that it was an earthquake.

Regional seismic monitoring in the Northeast, according to the Survey, relies on the Weston Observatory of Boston College, Lamont-Doherty Earth Observatory at Columbia University and the USGS.

“Boston College runs a 14-station broadband network in the New England region, LDEO operates an adjacent network of 40 short-period, broadband and strong motion stations primarily focusing on earthquake activity in New York, Pennsylvania and New Jersey and surrounding states, and the USGS operates and maintains complementary stations of the Advanced National Seismic System backbone seismic network,” according to the Geological Survey.

Over the last 24 hours, earthquakes have been detected around the world, in Alaska, Los Angeles, Sumatra, New Zealand, Chile, southern Greece and Illinois.

Texas had a few last week, as did Chile, Alabama, Puerto Rico and Japan.

Earlier in the summer, a small earthquake was detected in Brooksville, and last May, a swarm of small earthquakes — as many as 30 separate seismic events — was reported in the area from Bucksport to Belfast.

The largest earthquake in Maine struck in 1904 with a magnitude of 5.1. It knocked over chimneys in Calais and Eastport, and St. Stephen, New Brunswick, according to the survey. It was felt throughout most of New England, New Brunswick and Nova Scotia. It was observed west to the Hudson River and Montreal, and in southern Connecticut.

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