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At least 10 small earthquakes have hit eastern Conn.

A swarm of at least 10 earthquakes has rattled several small towns in eastern Connecticut since Thursday, officials at Boston College’s Weston Observatory said.

All of the quakes have been recorded in the area of Plainfield, Killingly, and Sterling, which are near the state’s border with Rhode Island, said John Ebel, director of the observatory, a geophysical research and education center.

It would not be surprising if there were more than 10 quakes, Ebel said, since some are too small to be detected by the observatory’s instruments.

It is impossible to tell if the quakes will continue, Ebel said, adding that there is less than a 1 percent chance of getting anything larger than a 3.3-magnitude quake.


The most recent temblor was a 2.3-magnitude quake in Danielson, a borough of Killingly, at 7:27 a.m. Tuesday, the US Geological Survey said. The largest was a 3.3-magnitude quake on the Plainfield-Sterling line recorded at 6:36 a.m. Monday.

That quake was felt throughout Eastern Connecticut, most of Rhode Island, and in a few Massachusetts towns, Ebel said.

It was the largest in New England since a 4.0-magnitude quake hit Maine on Oct. 16, 2012, said Justin Starr, a geophysicist at the observatory.

USGS data showed other larger temblors to be quakes of 2.0 magnitude on Thursday and 1.7 on Monday.

Aneri Pattani can be reached at aneri.pattani@globe.com.