QuakeIndex

mining explosion · reviewed by a seismologist

M 1.9ml

1 km WSW of Martinsville, New Jersey

· 0.0 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Somerset County 5 kmMiddlesex County 23 kmUnion County 24 kmHunterdon County 28 kmMorris County 29 kmEssex County 35 kmMercer County 36 kmRichmond County 37 kmHudson County 45 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
0.0 km below the surface
Felt
no reports yet
Nearest
Somerset County, 5 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1517 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as mining explosion, not an earthquake.

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 40.5959, -74.5813. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Somerset County, NJ 5 km (3 mi) NE of here earthquakes near Somerset County
Middlesex County, NJ 23 km (14 mi) NW of here earthquakes near Middlesex County
Union County, NJ 24 km (15 mi) WSW of here earthquakes near Union County
Hunterdon County, NJ 28 km (17 mi) E of here earthquakes near Hunterdon County
Morris County, NJ 29 km (18 mi) S of here earthquakes near Morris County
Essex County, NJ 35 km (22 mi) SW of here earthquakes near Essex 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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