QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9mwr

8 km SE of Arnold, Nebraska

· 5.0 km deep · released about 11 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Logan County 33 kmCuster County 34 kmDawson County 61 kmLincoln County 62 kmThomas County 64 kmBlaine County 65 kmLoup County 79 kmMcPherson County 89 kmFrontier County 95 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 3.9 (mwr)
Depth
5.0 km below the surface
Felt
41 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Nearest
Logan County, 33 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2928 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 41 people have reported feeling it to USGS.

How big was it?

This earthquake released about 11 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 16,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 710× the energy of this one
  3. Magna, Utah 2020 M 5.7 500× the energy of this one
  4. This earthquake M 3.9 about 11 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 22× more

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 41.3603, -100.1290. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Logan County, NE 33 km (21 mi) SE of here earthquakes near Logan County
Custer County, NE 34 km (21 mi) W of here earthquakes near Custer County
Dawson County, NE 61 km (38 mi) NNW of here earthquakes near Dawson County
Lincoln County, NE 62 km (39 mi) NE of here earthquakes near Lincoln County
Thomas County, NE 64 km (40 mi) SSE of here earthquakes near Thomas County
Blaine County, NE 65 km (40 mi) S of here earthquakes near Blaine County

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

Aftershocks so far

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

  1. 3.0 10 km S of Arnold, Nebraska
  2. 2.1 5 km S of Arnold, Nebraska
  3. 2.6 8 km SE of Arnold, Nebraska
  4. 2.5 13 km WNW of Callaway, Nebraska
  5. 2.6 7 km WSW of Arnold, Nebraska
  6. 2.6 6 km SE of Arnold, Nebraska
  7. 2.7 4 km E of Arnold, Nebraska
  8. 3.6 7 km SE of Arnold, Nebraska
  9. 2.0 4 km SE of Arnold, Nebraska
  10. 2.8 11 km SE of Arnold, Nebraska
  11. 2.4 7 km S of Arnold, Nebraska
  12. 2.4 8 km SSE of Arnold, Nebraska
  13. 3.6 5 km ESE of Arnold, Nebraska
  14. 2.7 8 km SE of Arnold, Nebraska
  15. 3.8 2 km SE of Arnold, Nebraska

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 4.1 on 2018-06-30 — it released about 2 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.