QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

15km SSW 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 Glenn County 29 kmButte County 40 kmColusa County 51 kmTehama County 58 kmSutter County 72 kmYuba County 73 kmLake County 82 kmYolo County 105 kmPlumas County 114 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
Glenn County, 29 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1937 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 39.6170, -122.0610. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 29 km (18 mi) E of here earthquakes near Glenn County
Butte County, CA 40 km (25 mi) W of here earthquakes near Butte County
Colusa County, CA 51 km (32 mi) NNE of here earthquakes near Colusa County
Tehama County, CA 58 km (36 mi) SSE of here earthquakes near Tehama County
Sutter County, CA 72 km (44 mi) NNW of here earthquakes near Sutter County
Yuba County, CA 73 km (45 mi) WNW of here earthquakes near Yuba County

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

Aftershocks so far

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

  1. 2.2 5 km WNW of Magalia, CA
  2. 1.8 19 km ESE of Willows, CA
  3. 2.7 14 km E of Willows, CA
  4. 2.1 15 km ESE of Willows, CA
  5. 2.2 5 km ESE of Hamilton City, CA
  6. 2.7 7 km NNE of Hamilton City, CA
  7. 2.4 6 km NNE of Hamilton City, CA
  8. 2.2 6 km NNE of Hamilton City, CA
  9. 2.3 9 km E of Los Molinos, CA
  10. 3.1 14 km NNE of Maxwell, CA
  11. 2.3 14 km NNE of Maxwell, CA
  12. 2.1 17 km ESE of Willows, CA
  13. 2.1 6 km W of Magalia, CA
  14. 2.3 7 km WNW of Hamilton City, CA
  15. 2.5 8 km E of Orland, 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.