QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km S of Canterbury, New Hampshire

· 2.8 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Merrimack County 9 kmBelknap County 27 kmStrafford County 43 kmHillsborough County 45 kmRockingham County 51 kmSullivan County 53 kmCheshire County 69 kmCarroll County 70 kmGrafton County 73 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 1.8 (ml)
Depth
2.8 km below the surface
Felt
3 reports · strongest reported intensity III
Nearest
Merrimack County, 9 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1800 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 43.2991, -71.5680. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Merrimack County, NH 9 km (6 mi) E of here earthquakes near Merrimack County
Belknap County, NH 27 km (17 mi) SSW of here earthquakes near Belknap County
Strafford County, NH 43 km (27 mi) W of here earthquakes near Strafford County
Hillsborough County, NH 45 km (28 mi) NNE of here earthquakes near Hillsborough County
Rockingham County, NH 51 km (32 mi) NW of here earthquakes near Rockingham County
Sullivan County, NH 53 km (33 mi) E of here earthquakes near Sullivan County

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

Aftershocks so far

21 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.