QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

6km SSE of Willows, CA

· 18 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 24 kmColusa County 33 kmButte County 54 kmSutter County 63 kmLake County 63 kmTehama County 73 kmYuba County 75 kmYolo County 91 kmNapa 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 1.8 (md)
Depth
18 km below the surface
Felt
no reports yet
Nearest
Glenn County, 24 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2260 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 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 39.4697, -122.1780. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 24 km (15 mi) SE of here earthquakes near Glenn County
Colusa County, CA 33 km (20 mi) N of here earthquakes near Colusa County
Butte County, CA 54 km (33 mi) WSW of here earthquakes near Butte County
Sutter County, CA 63 km (39 mi) NW of here earthquakes near Sutter County
Lake County, CA 63 km (39 mi) NE of here earthquakes near Lake County
Tehama County, CA 73 km (45 mi) S of here earthquakes near Tehama County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.6 12km S of Hamilton City, CA
  2. 2.7 5km N of Hamilton City, CA
  3. 2.2 15km SW of Orland, CA
  4. 2.1 10km W of Willows, CA
  5. 1.7 9km W of Williams, CA
  6. 3.7 10km WSW of Williams, CA
  7. 2.1 9km WSW of Williams, CA
  8. 2.0 11km NNW of Chico, CA
  9. 1.7 14km S of Hamilton City, CA
  10. 1.8 7km NW of Stony Gorge Reservoir, CA
  11. 2.2 15km ENE of Willows, CA
  12. 2.9 6km NNE of Hamilton City, CA
  13. 2.5 6km NW of Chico, CA
  14. 2.5 5km NNE of Hamilton City, CA
  15. 2.0 1km WNW of Stony Gorge Reservoir, 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.