QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

6 km of Dunnigan, CA

· 0.1 km deep · released about 46 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sutter County 28 kmYolo County 29 kmColusa County 34 kmNapa County 55 kmYuba County 67 kmLake County 68 kmSolano County 74 kmSacramento County 78 kmGlenn County 82 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
0.1 km below the surface
Felt
no reports yet
Nearest
Sutter County, 28 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 646 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 46 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 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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 38.9323, -121.9935. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sutter County, CA 28 km (17 mi) WSW of here earthquakes near Sutter County
Yolo County, CA 29 km (18 mi) NNW of here earthquakes near Yolo County
Colusa County, CA 34 km (21 mi) SE of here earthquakes near Colusa County
Napa County, CA 55 km (34 mi) NNE of here earthquakes near Napa County
Yuba County, CA 67 km (42 mi) WSW of here earthquakes near Yuba County
Lake County, CA 68 km (42 mi) ESE of here earthquakes near Lake County

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

Aftershocks so far

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

  1. 1.7 20 km W of Winters, CA
  2. 1.6 18 km WNW of Winters, CA
  3. 2.9 20 km W of Winters, CA
  4. 1.7 11 km ESE of Hidden Valley Lake, CA
  5. 2.0 10 km ENE of Hidden Valley Lake, CA
  6. 1.5 10 km ENE of Hidden Valley Lake, CA
  7. 1.9 10 km ENE of Hidden Valley Lake, CA
  8. 2.4 10 km ENE of Hidden Valley Lake, CA
  9. 1.5 9 km ENE of Hidden Valley Lake, CA
  10. 1.9 9 km ENE of Clearlake, CA
  11. 1.6 14 km ESE of Hidden Valley Lake, CA
  12. 1.7 10 km ENE of Hidden Valley Lake, CA
  13. 1.6 10 km ENE of Hidden Valley Lake, CA
  14. 1.9 10 km ESE of Hidden Valley Lake, CA
  15. 1.8 9 km E of Hidden Valley Lake, 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.