QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

12 km SSE of Willows, CA

· 26 km deep · released about 430 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Colusa County 29 kmGlenn County 30 kmButte County 53 kmSutter County 57 kmLake County 63 kmYuba County 70 kmTehama County 78 kmYolo County 86 kmNapa County 104 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 2.8 (ml)
Depth
26 km below the surface
Felt
6 reports · strongest reported intensity II
Nearest
Colusa County, 29 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 214 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 6 people have reported feeling it to USGS.

How big was it?

This earthquake released about 430 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 35,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 25,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.2× the energy of this one
  4. This earthquake M 2.8 about 430 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 39.4293, -122.1357. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Colusa County, CA 29 km (18 mi) NNE of here earthquakes near Colusa County
Glenn County, CA 30 km (19 mi) SE of here earthquakes near Glenn County
Butte County, CA 53 km (33 mi) WSW of here earthquakes near Butte County
Sutter County, CA 57 km (36 mi) NW of here earthquakes near Sutter County
Lake County, CA 63 km (39 mi) NE of here earthquakes near Lake County
Yuba County, CA 70 km (44 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

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

  1. 2.0 5 km E of Williams, CA
  2. 2.7 5 km W of Hamilton City, CA
  3. 1.9 7 km ESE of Williams, CA
  4. 2.5 15 km S of Hamilton City, CA
  5. 2.2 4 km WSW of Hamilton City, CA
  6. 2.0 17 km E of Willows, CA
  7. 1.9 19 km E of Willows, CA
  8. 1.9 8 km WSW of Arbuckle, CA
  9. 2.4 9 km S of Hamilton City, CA
  10. 3.1 9 km ENE of Colusa, CA
  11. 3.2 15 km E of Willows, CA
  12. 2.1 16 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.