QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

6km SW of Arbuckle, CA

· 27 km deep · released about 24 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Colusa County 25 kmSutter County 35 kmYolo County 38 kmNapa County 56 kmLake County 57 kmYuba County 73 kmGlenn County 74 kmSolano County 80 kmSonoma County 87 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
27 km below the surface
Felt
no reports yet
Nearest
Colusa County, 25 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1780 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 24 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 5.8 640,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 450,000× the energy of this one
  3. Around the size people start to feel M 3.0 40× the energy of this one
  4. This earthquake M 1.9 about 24 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 38.9787, -122.1048. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Colusa County, CA 25 km (15 mi) SSE of here earthquakes near Colusa County
Sutter County, CA 35 km (22 mi) W of here earthquakes near Sutter County
Yolo County, CA 38 km (23 mi) NNW of here earthquakes near Yolo County
Napa County, CA 56 km (35 mi) NNE of here earthquakes near Napa County
Lake County, CA 57 km (36 mi) ESE of here earthquakes near Lake County
Yuba County, CA 73 km (45 mi) WSW of here earthquakes near Yuba County

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

Aftershocks so far

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

  1. 1.5 13km ESE of Hidden Valley Lake, CA
  2. 1.7 1km SE of Clearlake, CA
  3. 1.6 3km WNW of Lower Lake, CA
  4. 1.9 4km WNW of Lower Lake, CA
  5. 2.2 4km W of Lower Lake, CA
  6. 1.9 11km ENE of Hidden Valley Lake, CA
  7. 1.6 19km ENE of Clearlake Oaks, CA
  8. 1.7 14km E of Angwin, CA
  9. 1.5 15km E of Angwin, CA
  10. 1.6 13km ESE of Hidden Valley Lake, CA
  11. 2.0 12km ESE of Hidden Valley Lake, CA
  12. 1.9 12km ESE of Hidden Valley Lake, CA
  13. 2.0 12km ESE of Hidden Valley Lake, CA
  14. 1.7 17km E of Angwin, CA
  15. 2.2 15km ENE of Angwin, 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.