QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

6 km NW of Dunnigan, CA

· 16 km deep · released about 79 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yolo County 28 kmSutter County 31 kmColusa County 35 kmNapa County 52 kmLake County 66 kmYuba County 71 kmSolano County 72 kmSacramento County 79 kmGlenn County 83 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 2.3 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Yolo County, 28 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 487 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 79 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 190,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 79 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 38.9113, -122.0298. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Yolo County, CA 28 km (17 mi) NNW of here earthquakes near Yolo County
Sutter County, CA 31 km (20 mi) WSW of here earthquakes near Sutter County
Colusa County, CA 35 km (22 mi) SSE of here earthquakes near Colusa County
Napa County, CA 52 km (32 mi) NNE of here earthquakes near Napa County
Lake County, CA 66 km (41 mi) ESE of here earthquakes near Lake County
Yuba County, CA 71 km (44 mi) SW of here earthquakes near Yuba County

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

Aftershocks so far

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

  1. 1.6 14 km ESE of Hidden Valley Lake, CA
  2. 1.9 7 km ESE of Williams, CA
  3. 1.5 13 km SE of Middletown, CA
  4. 2.0 5 km E of Hidden Valley Lake, CA
  5. 2.6 12 km SE of Middletown, CA
  6. 1.9 8 km E of Angwin, CA
  7. 1.9 14 km NNE of Angwin, CA
  8. 2.0 13 km NNE of Angwin, CA
  9. 1.9 8 km WSW of Arbuckle, CA
  10. 2.0 10 km ESE of Hidden Valley Lake, CA
  11. 2.1 13 km SE of Middletown, CA
  12. 2.2 9 km SSW of South Yuba City, CA
  13. 2.3 9 km E of Lower Lake, CA
  14. 2.1 7 km E of Lower Lake, CA
  15. 2.1 7 km E of Lower 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.