QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4mb_lg

5 km ENE of Contoocook, New Hampshire

· 3.2 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Merrimack County 6 kmBelknap County 36 kmHillsborough County 38 kmSullivan County 47 kmStrafford County 51 kmRockingham County 54 kmCheshire County 60 kmGrafton County 77 kmCarroll County 78 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 2.4 (mb_lg)
Depth
3.2 km below the surface
Felt
90 reports · strongest reported intensity IV
Nearest
Merrimack County, 6 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3033 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 90 people have reported feeling it to USGS.

How big was it?

This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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 43.2483, -71.6596. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Merrimack County, NH 6 km (4 mi) SSE of here earthquakes near Merrimack County
Belknap County, NH 36 km (22 mi) SSW of here earthquakes near Belknap County
Hillsborough County, NH 38 km (23 mi) N of here earthquakes near Hillsborough County
Sullivan County, NH 47 km (29 mi) ESE of here earthquakes near Sullivan County
Strafford County, NH 51 km (32 mi) W of here earthquakes near Strafford County
Rockingham County, NH 54 km (33 mi) WNW of here earthquakes near Rockingham County

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

Aftershocks so far

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

  1. 1.5 2 km S of Bedford, New Hampshire
  2. 2.1 2 km NNW of Milford, New Hampshire
  3. 1.9 2 km N of Webster, New Hampshire
  4. 1.9 4 km ESE of Northfield, New Hampshire
  5. 1.5 5 km SSE of Boscawen, New Hampshire
  6. 1.5 6 km SE of New Hampton, New Hampshire
  7. 2.0 5 km S of Alton, New Hampshire
  8. 1.6 2 km S of Henniker, New Hampshire
  9. 2.2 4 km NW of Gilford, New Hampshire
  10. 2.0 2 km WNW of Loudon, New Hampshire
  11. 2.7 5 km SW of Chichester, New Hampshire
  12. 2.2 1 km W of Andover, New Hampshire
  13. 2.1 4 km SE of Warner, New Hampshire
  14. 1.9 0 km SW of Bow Bog, New Hampshire
  15. 1.9 5 km SW of New Durham, 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.