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Some people in central New Hampshire reported feeling a small earthquake that struck below the north shore of Lake Winnipesaukee on Tuesday morning.
The USGS has confirmed a 2.9-magnitude earthquake that struck southwest Sandwich, New Hampshire, around 9:49 a.m. The quake originated about 4.2 miles below the Earth’s surface.
It was felt as far west as Hanover and as far east as Parsonfield, Maine, across the border, according to the USGS’s incident page. It has also been felt in south Manchester and north of the White Mountain National Forest.
The magnitude of the earthquake increases on a logarithmic scale, which means that magnitude 3 is 10 times weaker than magnitude 4 and so on. There are about 100,000 magnitude 3 earthquakes each year, according to the USGS. Usually too weak to cause property damage, it releases the same amount of energy as a large bolt of lightning.
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