QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

6 km W of Hamilton City, CA

· 28 km deep · released about 630 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 32 kmButte County 42 kmTehama County 44 kmColusa County 65 kmYuba County 82 kmSutter County 85 kmLake County 91 kmPlumas County 110 kmShasta County 113 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 2.9 (md)
Depth
28 km below the surface
Felt
no reports yet
Nearest
Glenn County, 32 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 943 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 630 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 24,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 17,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.5× the energy of this one
  4. This earthquake M 2.9 about 630 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 39.7487, -122.0773. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 32 km (20 mi) ENE of here earthquakes near Glenn County
Butte County, CA 42 km (26 mi) WNW of here earthquakes near Butte County
Tehama County, CA 44 km (27 mi) SSE of here earthquakes near Tehama County
Colusa County, CA 65 km (40 mi) NNE of here earthquakes near Colusa County
Yuba County, CA 82 km (51 mi) NW of here earthquakes near Yuba County
Sutter County, CA 85 km (53 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

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

  1. 2.7 5 km W of Hamilton City, CA
  2. 2.5 9 km E of Rancho Tehama Reserve, CA
  3. 2.5 15 km S of Hamilton City, CA
  4. 2.2 4 km WSW of Hamilton City, CA
  5. 2.0 17 km E of Willows, CA
  6. 2.4 11 km NNE of Gerber, CA
  7. 2.2 21 km NE of Alder Springs, CA
  8. 1.9 19 km E of Willows, CA
  9. 2.7 4 km WSW of Red Bluff, CA
  10. 2.4 9 km S of Hamilton City, CA
  11. 1.9 5 km WSW of Concow, CA
  12. 3.2 15 km E of Willows, CA
  13. 2.1 16 km ESE of Willows, CA
  14. 2.3 13 km NNW of Chico, CA
  15. 2.8 12 km SSE 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.