QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2mb_lg

1 km W of Andover, New Hampshire

· 6.5 km deep · released about 60 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Merrimack County 20 kmSullivan County 32 kmBelknap County 35 kmGrafton County 55 kmHillsborough County 59 kmWindsor County 63 kmCheshire County 66 kmStrafford County 67 kmCarroll County 71 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.2 (mb_lg)
Depth
6.5 km below the surface
Felt
25 reports · strongest reported intensity IV
Nearest
Merrimack County, 20 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1009 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 25 people have reported feeling it to USGS.

How big was it?

This earthquake released about 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 60 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 43.4358, -71.8439. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Merrimack County, NH 20 km (13 mi) NW of here earthquakes near Merrimack County
Sullivan County, NH 32 km (20 mi) ENE of here earthquakes near Sullivan County
Belknap County, NH 35 km (22 mi) WSW of here earthquakes near Belknap County
Grafton County, NH 55 km (34 mi) S of here earthquakes near Grafton County
Hillsborough County, NH 59 km (37 mi) N of here earthquakes near Hillsborough County
Windsor County, VT 63 km (39 mi) ESE of here earthquakes near Windsor County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

8 earthquakes have been recorded within 50 km since this one.

  1. 1.9 2 km N of Webster, New Hampshire
  2. 1.9 4 km ESE of Northfield, New Hampshire
  3. 1.5 5 km SSE of Boscawen, New Hampshire
  4. 1.5 6 km SE of New Hampton, New Hampshire
  5. 1.6 2 km S of Henniker, New Hampshire
  6. 2.2 4 km NW of Gilford, New Hampshire
  7. 2.0 2 km WNW of Loudon, New Hampshire
  8. 2.7 5 km SW of Chichester, New Hampshire

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.