QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

0 km ENE of Milford, New Jersey

· 2.0 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hunterdon County 15 kmBucks County 26 kmNorthampton County 28 kmWarren County 32 kmSomerset County 39 kmLehigh County 43 kmMercer County 46 kmMontgomery County 47 kmMorris County 55 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 2.1 (ml)
Depth
2.0 km below the surface
Felt
46 reports · strongest reported intensity IV
Nearest
Hunterdon County, 15 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 523 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 46 people have reported feeling it to USGS.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 40.5721, -75.0839. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hunterdon County, NJ 15 km (9 mi) W of here earthquakes near Hunterdon County
Bucks County, PA 26 km (16 mi) N of here earthquakes near Bucks County
Northampton County, PA 28 km (17 mi) SE of here earthquakes near Northampton County
Warren County, NJ 32 km (20 mi) SSW of here earthquakes near Warren County
Somerset County, NJ 39 km (24 mi) W of here earthquakes near Somerset County
Lehigh County, PA 43 km (27 mi) E of here earthquakes near Lehigh County

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

Aftershocks so far

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

  1. 1.5 6 km SSE of Long Valley, New Jersey
  2. 1.6 6 km ESE of Califon, New Jersey
  3. 2.9 7 km WSW of Gladstone, New Jersey
  4. 1.6 7 km E of Califon, New Jersey
  5. 1.5 5 km SW of Gladstone, New Jersey
  6. 2.1 6 km W of Gladstone, New Jersey
  7. 1.5 5 km E of Califon, New Jersey
  8. 1.5 5 km NNE of Whitehouse Station, New Jersey
  9. 1.5 5 km N of Whitehouse Station, New Jersey
  10. 1.5 3 km NNE of Whitehouse Station, New Jersey
  11. 1.8 4 km SW of Gladstone, New Jersey
  12. 1.9 5 km SW of Gladstone, New Jersey
  13. 1.7 6 km ESE of Califon, New Jersey
  14. 1.5 5 km ESE of Califon, New Jersey
  15. 1.9 5 km SW of Gladstone, New Jersey

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

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