QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

5 km ESE of Litchfield, New Hampshire

· 5.0 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hillsborough County 27 kmRockingham County 32 kmMiddlesex County 38 kmEssex County 49 kmMerrimack County 57 kmStrafford County 61 kmSuffolk County 63 kmCheshire County 69 kmWorcester 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 1.9 (ml)
Depth
5.0 km below the surface
Felt
7 reports · strongest reported intensity III
Nearest
Hillsborough County, 27 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2861 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 7 people have reported feeling it to USGS.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 42.8221, -71.4167. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hillsborough County, NH 27 km (17 mi) ESE of here earthquakes near Hillsborough County
Rockingham County, NH 32 km (20 mi) SW of here earthquakes near Rockingham County
Middlesex County, MA 38 km (24 mi) N of here earthquakes near Middlesex County
Essex County, MA 49 km (31 mi) WNW of here earthquakes near Essex County
Merrimack County, NH 57 km (36 mi) SSE of here earthquakes near Merrimack County
Strafford County, NH 61 km (38 mi) SSW of here earthquakes near Strafford County

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

Aftershocks so far

11 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. 1.7 2 km NE of Danville, New Hampshire
  4. 1.6 2 km S of Henniker, New Hampshire
  5. 1.7 3 km SW of Townsend, Massachusetts
  6. 2.7 5 km SW of Chichester, New Hampshire
  7. 1.9 0 km SW of Bow Bog, New Hampshire
  8. 1.8 1 km S of Boxborough, Massachusetts
  9. 2.3 3 km NNE of Antrim, New Hampshire
  10. 1.9 6 km E of Weare, New Hampshire
  11. 1.8 2 km W of Salem, 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.