QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

5 km NNW of Sanbornton, New Hampshire

· 4.1 km deep · released about 85 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Belknap County 14 kmMerrimack County 27 kmGrafton County 48 kmCarroll County 49 kmStrafford County 53 kmSullivan County 54 kmHillsborough County 70 kmRockingham County 73 kmYork County 76 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 2.3 (ml)
Depth
4.1 km below the surface
Felt
13 reports · strongest reported intensity IV
Nearest
Belknap County, 14 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1640 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 13 people have reported feeling it to USGS.

How big was it?

This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 43.5360, -71.5974. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Belknap County, NH 14 km (9 mi) W of here earthquakes near Belknap County
Merrimack County, NH 27 km (17 mi) NNE of here earthquakes near Merrimack County
Grafton County, NH 48 km (30 mi) SSE of here earthquakes near Grafton County
Carroll County, NH 49 km (30 mi) SW of here earthquakes near Carroll County
Strafford County, NH 53 km (33 mi) WNW of here earthquakes near Strafford County
Sullivan County, NH 54 km (34 mi) ENE of here earthquakes near Sullivan County

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

Aftershocks so far

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

  1. 1.6 2 km SW of Center Sandwich, New Hampshire
  2. 1.9 2 km N of Webster, New Hampshire
  3. 1.9 4 km ESE of Northfield, New Hampshire
  4. 1.5 5 km SSE of Boscawen, New Hampshire
  5. 1.5 6 km SE of New Hampton, New Hampshire
  6. 2.0 5 km S of Alton, New Hampshire
  7. 1.6 2 km S of Henniker, New Hampshire
  8. 2.2 4 km NW of Gilford, New Hampshire
  9. 2.0 2 km WNW of Loudon, New Hampshire
  10. 2.7 5 km SW of Chichester, New Hampshire
  11. 2.2 1 km W of Andover, New Hampshire
  12. 1.8 3 km SW of Center Sandwich, New Hampshire
  13. 2.9 4 km SW of Center Sandwich, New Hampshire
  14. 2.1 4 km SE of Warner, New Hampshire
  15. 1.9 0 km SW of Bow Bog, 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.