QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

15km E of Willows, CA

· 27 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 34 kmButte County 40 kmColusa County 41 kmSutter County 59 kmYuba County 64 kmTehama County 71 kmLake County 76 kmYolo County 93 kmNevada County 110 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
27 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Glenn County, 34 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2181 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 40 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 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 39.5072, -122.0223. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 34 km (21 mi) ESE of here earthquakes near Glenn County
Butte County, CA 40 km (25 mi) WSW of here earthquakes near Butte County
Colusa County, CA 41 km (26 mi) NNE of here earthquakes near Colusa County
Sutter County, CA 59 km (37 mi) NNW of here earthquakes near Sutter County
Yuba County, CA 64 km (40 mi) WNW of here earthquakes near Yuba County
Tehama County, CA 71 km (44 mi) SSE of here earthquakes near Tehama 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. 2.1 8km WSW of Durham, CA
  2. 2.3 14km S of Hamilton City, CA
  3. 2.4 10km WSW of Williams, CA
  4. 1.9 3km NW of Chico, CA
  5. 2.1 10km N of Oroville, CA
  6. 2.7 2km NW of Chico, CA
  7. 2.1 13km SSE of Willows, CA
  8. 4.2 5km S of Oroville East, CA
  9. 2.6 12km S of Hamilton City, CA
  10. 2.7 5km N of Hamilton City, CA
  11. 2.2 15km SW of Orland, CA
  12. 2.1 10km W of Willows, CA
  13. 1.8 10km N of Oroville, CA
  14. 1.7 9km W of Williams, CA
  15. 3.7 10km WSW of Williams, 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.