QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

18km E of Willows, CA

· 22 km deep · released about 18 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Butte County 35 kmGlenn County 37 kmColusa County 47 kmSutter County 62 kmYuba County 63 kmTehama County 68 kmLake County 82 kmYolo County 97 kmNevada County 108 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 1.9 (md)
Depth
22 km below the surface
Felt
no reports yet
Nearest
Butte County, 35 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2987 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 18 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 840,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 600,000× the energy of this one
  3. Around the size people start to feel M 3.0 53× the energy of this one
  4. This earthquake M 1.9 about 18 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 39.5483, -121.9807. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Butte County, CA 35 km (22 mi) WSW of here earthquakes near Butte County
Glenn County, CA 37 km (23 mi) E of here earthquakes near Glenn County
Colusa County, CA 47 km (29 mi) NNE of here earthquakes near Colusa County
Sutter County, CA 62 km (38 mi) NNW of here earthquakes near Sutter County
Yuba County, CA 63 km (39 mi) WNW of here earthquakes near Yuba County
Tehama County, CA 68 km (42 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

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

  1. 1.8 5km SW of Hamilton City, CA
  2. 2.4 6km SW of Hamilton City, CA
  3. 1.9 10km NNW of Oroville, CA
  4. 1.8 14km N of Colusa, CA
  5. 2.5 15km ENE of Willows, CA
  6. 1.6 4km NNE of Hamilton City, CA
  7. 1.6 12km SE of Willows, CA
  8. 2.2 16km N of Colusa, CA
  9. 1.9 6km SW of Hamilton City, CA
  10. 1.8 6km SW of Hamilton City, CA
  11. 2.5 5km NNE of Hamilton City, CA
  12. 2.5 4km SE of Concow, CA
  13. 1.9 10km N of Oroville, CA
  14. 1.9 10km SSE of Hamilton City, CA
  15. 2.0 5km NNE of Hamilton City, 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.