QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

14 km ESE of Hidden Valley Lake, CA

· 7.5 km deep · released about 74 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 29 kmYolo County 46 kmLake County 48 kmColusa County 50 kmSonoma County 51 kmSolano County 68 kmSutter County 69 kmMarin County 83 kmGlenn County 94 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
7.5 km below the surface
Felt
no reports yet
Nearest
Napa County, 29 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 946 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 74 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 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 13× the energy of this one
  4. This earthquake M 2.3 about 74 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 38.7538, -122.4188. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 29 km (18 mi) NNW of here earthquakes near Napa County
Yolo County, CA 46 km (28 mi) W of here earthquakes near Yolo County
Lake County, CA 48 km (30 mi) SE of here earthquakes near Lake County
Colusa County, CA 50 km (31 mi) SSW of here earthquakes near Colusa County
Sonoma County, CA 51 km (32 mi) ENE of here earthquakes near Sonoma County
Solano County, CA 68 km (42 mi) NW of here earthquakes near Solano County

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

Aftershocks so far

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

  1. 2.2 6 km WNW of The Geysers, CA
  2. 1.6 7 km W of Cobb, CA
  3. 1.8 6 km W of Cobb, CA
  4. 2.2 3 km W of Anderson Springs, CA
  5. 1.5 3 km S of Cobb, CA
  6. 2.1 10 km WNW of The Geysers, CA
  7. 1.7 4 km WNW of Cobb, CA
  8. 1.5 2 km ESE of The Geysers, CA
  9. 1.7 4 km NW of The Geysers, CA
  10. 2.3 8 km NW of The Geysers, CA
  11. 1.8 7 km W of Cobb, CA
  12. 1.9 6 km W of Glen Ellen, CA
  13. 2.1 2 km ESE of The Geysers, CA
  14. 1.7 4 km NNW of The Geysers, CA
  15. 1.6 4 km WSW of Cobb, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.0 on 2016-12-14 — it released about 13,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.