QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

5km NNE of Hamilton City, CA

· 20 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Butte County 37 kmGlenn County 40 kmTehama County 43 kmColusa County 71 kmYuba County 80 kmSutter County 87 kmLake County 99 kmPlumas County 103 kmShasta County 108 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 (md)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Butte County, 37 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2263 days ago

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

How big was it?

This earthquake released about 17 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 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× the energy of this one
  4. This earthquake M 1.8 about 17 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 39.7863, -122.0007. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Butte County, CA 37 km (23 mi) WNW of here earthquakes near Butte County
Glenn County, CA 40 km (25 mi) ENE of here earthquakes near Glenn County
Tehama County, CA 43 km (26 mi) SSE of here earthquakes near Tehama County
Colusa County, CA 71 km (44 mi) NNE of here earthquakes near Colusa County
Yuba County, CA 80 km (50 mi) NW of here earthquakes near Yuba County
Sutter County, CA 87 km (54 mi) NNW of here earthquakes near Sutter County

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

Aftershocks so far

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

  1. 2.0 10km N of Oroville, CA
  2. 2.9 6km NNE of Hamilton City, CA
  3. 2.5 6km NW of Chico, CA
  4. 2.5 5km NNE of Hamilton City, CA
  5. 1.8 4km NNE of Hamilton City, CA
  6. 2.0 9km N of Oroville, CA
  7. 1.9 14km S of Hamilton City, CA
  8. 2.6 15km E of Willows, CA
  9. 2.6 16km E of Willows, CA
  10. 2.3 16km E of Willows, CA
  11. 2.1 6km N of Hamilton City, CA
  12. 1.8 15km ENE of Willows, CA
  13. 1.8 5km W of Paradise, CA
  14. 1.6 9km N of Biggs, CA
  15. 2.2 15km E of Willows, CA

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.