QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km SW of Gladstone, New Jersey

· 8.6 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Somerset County 17 kmMorris County 22 kmHunterdon County 23 kmWarren County 31 kmUnion County 34 kmMiddlesex County 38 kmEssex County 40 kmMercer County 47 kmSussex County 49 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
8.6 km below the surface
Felt
17 reports · strongest reported intensity IV
Nearest
Somerset County, 17 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 832 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 17 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 40.7007, -74.7051. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Somerset County, NJ 17 km (10 mi) NNW of here earthquakes near Somerset County
Morris County, NJ 22 km (14 mi) SW of here earthquakes near Morris County
Hunterdon County, NJ 23 km (14 mi) NE of here earthquakes near Hunterdon County
Warren County, NJ 31 km (19 mi) ESE of here earthquakes near Warren County
Union County, NJ 34 km (21 mi) W of here earthquakes near Union County
Middlesex County, NJ 38 km (24 mi) NW of here earthquakes near Middlesex County

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

Aftershocks so far

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

  1. 1.8 5 km W of Gladstone, New Jersey
  2. 1.5 1 km NNE of Califon, New Jersey
  3. 2.4 5 km WSW of Bedminster, New Jersey
  4. 1.8 5 km WSW of Gladstone, New Jersey
  5. 1.6 4 km ESE of Califon, New Jersey
  6. 2.0 3 km SE of Randolph, New Jersey
  7. 1.6 3 km SSE of Randolph, New Jersey
  8. 1.5 6 km NE of Lebanon, New Jersey
  9. 1.9 5 km W of Bedminster, New Jersey
  10. 1.7 5 km E of Califon, New Jersey
  11. 1.8 7 km WSW of Gladstone, New Jersey
  12. 1.5 4 km ESE of Califon, New Jersey
  13. 1.6 6 km ESE of Califon, New Jersey
  14. 1.6 7 km ESE of Califon, New Jersey
  15. 1.6 6 km ESE of Califon, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.8 on 2024-04-05 — it released about 32,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.