QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

9km NW of Hamilton City, CA

· 29 km deep · released about 47 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 33 kmTehama County 39 kmButte County 45 kmColusa County 69 kmYuba County 87 kmSutter County 91 kmLake County 94 kmShasta County 108 kmPlumas County 111 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 2.1 (md)
Depth
29 km below the surface
Felt
no reports yet
Nearest
Glenn County, 33 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2768 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 47 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 320,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 20× the energy of this one
  4. This earthquake M 2.1 about 47 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 39.7910, -122.1017. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 33 km (21 mi) NE of here earthquakes near Glenn County
Tehama County, CA 39 km (24 mi) SSE of here earthquakes near Tehama County
Butte County, CA 45 km (28 mi) WNW of here earthquakes near Butte County
Colusa County, CA 69 km (43 mi) N of here earthquakes near Colusa County
Yuba County, CA 87 km (54 mi) NW of here earthquakes near Yuba County
Sutter County, CA 91 km (56 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

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

  1. 1.7 3km NNE of Hamilton City, CA
  2. 1.7 4km NNE of Hamilton City, CA
  3. 2.6 13km WSW of Durham, CA
  4. 2.8 4km N of Hamilton City, CA
  5. 1.6 17km WSW of Durham, CA
  6. 1.7 10km N of Thermalito, CA
  7. 1.9 5km W of Hamilton City, CA
  8. 1.8 1km NNE of Chico, CA
  9. 1.8 6km NNE of Gerber, CA
  10. 1.8 5km SW of Hamilton City, CA
  11. 2.4 6km SW of Hamilton City, CA
  12. 1.9 10km NNW of Oroville, CA
  13. 2.5 15km ENE of Willows, CA
  14. 1.6 4km NNE of Hamilton City, CA
  15. 1.6 12km SE 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.