QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

4 km ESE of Northfield, 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 Belknap County 15 kmMerrimack County 17 kmStrafford County 43 kmSullivan County 55 kmHillsborough County 57 kmCarroll County 58 kmRockingham County 59 kmGrafton County 62 kmYork 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
2 reports · strongest reported intensity III
Nearest
Belknap County, 15 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 240 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 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 43.4100, -71.5437. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Belknap County, NH 15 km (10 mi) SW of here earthquakes near Belknap County
Merrimack County, NH 17 km (10 mi) NE of here earthquakes near Merrimack County
Strafford County, NH 43 km (27 mi) WNW of here earthquakes near Strafford County
Sullivan County, NH 55 km (34 mi) E of here earthquakes near Sullivan County
Hillsborough County, NH 57 km (36 mi) NNE of here earthquakes near Hillsborough County
Carroll County, NH 58 km (36 mi) SSW of here earthquakes near Carroll County

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

Aftershocks so far

2 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

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.