QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

13km SSE of Willows, CA

· 25 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Colusa County 28 kmGlenn County 31 kmButte County 54 kmSutter County 56 kmLake County 62 kmYuba County 70 kmTehama County 80 kmYolo County 84 kmNapa County 102 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
25 km below the surface
Felt
no reports yet
Nearest
Colusa County, 28 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1497 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 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 39.4125, -122.1355. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Colusa County, CA 28 km (17 mi) NNE of here earthquakes near Colusa County
Glenn County, CA 31 km (19 mi) SE of here earthquakes near Glenn County
Butte County, CA 54 km (33 mi) WSW of here earthquakes near Butte County
Sutter County, CA 56 km (35 mi) NW of here earthquakes near Sutter County
Lake County, CA 62 km (39 mi) ENE of here earthquakes near Lake County
Yuba County, CA 70 km (43 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

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

  1. 3.2 15 km E of Willows, CA
  2. 2.1 16 km ESE of Willows, CA
  3. 2.8 12 km SSE of Willows, CA
  4. 2.2 3 km SE of Hamilton City, CA
  5. 2.5 15 km ENE of Willows, CA
  6. 2.1 11 km WSW of Durham, CA
  7. 1.9 2 km SSE of Hamilton City, CA
  8. 1.9 7 km E of Arbuckle, CA
  9. 2.5 17 km E of Willows, CA
  10. 1.9 17 km E of Willows, CA
  11. 2.3 16 km ESE of Willows, CA
  12. 1.5 20 km ENE of Clearlake, CA
  13. 1.7 20 km E of Clearlake Oaks, CA
  14. 1.8 10 km ESE of Alder Springs, CA
  15. 1.8 19 km ESE 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.