http://wokq.com/we-know-why-f-15-jets-were-flying-over-manchester-this-past-weekend/
Earthquake Information for Grafton County, New Hampshire
Grafton County, NH has a low earthquake risk, with a total of 4 earthquakes since 1931. The USGS database shows that there is a 3.11% chance of a major earthquake within 50km of Grafton County, NH within the next 50 years. The largest earthquake within 30 miles of Grafton County, NH was a 3.8 Magnitude in 1995.
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