QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

9 km E of Lower Lake, CA

· 8.6 km deep · released about 77 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 30 kmColusa County 38 kmNapa County 48 kmSonoma County 56 kmYolo County 59 kmSutter County 71 kmGlenn County 77 kmSolano County 87 kmMarin County 98 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
8.6 km below the surface
Felt
no reports yet
Nearest
Lake County, 30 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 181 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 77 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 12× the energy of this one
  4. This earthquake M 2.3 about 77 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 38.9140, -122.5100. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 30 km (18 mi) SE of here earthquakes near Lake County
Colusa County, CA 38 km (23 mi) SW of here earthquakes near Colusa County
Napa County, CA 48 km (30 mi) NNW of here earthquakes near Napa County
Sonoma County, CA 56 km (35 mi) NE of here earthquakes near Sonoma County
Yolo County, CA 59 km (36 mi) WNW of here earthquakes near Yolo County
Sutter County, CA 71 km (44 mi) W of here earthquakes near Sutter County

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

Aftershocks so far

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

  1. 1.6 2 km SW of Anderson Springs, CA
  2. 1.8 3 km NW of The Geysers, CA
  3. 2.3 6 km WNW of Cobb, CA
  4. 1.7 1 km WSW of Anderson Springs, CA
  5. 1.6 2 km NNW of The Geysers, CA
  6. 2.1 8 km NW of The Geysers, CA
  7. 1.5 7 km NW of The Geysers, CA
  8. 2.3 6 km NW of The Geysers, CA
  9. 1.9 6 km NW of The Geysers, CA
  10. 1.6 2 km NW of The Geysers, CA
  11. 1.8 7 km NW of The Geysers, CA
  12. 1.9 8 km WNW of Cobb, CA
  13. 1.6 11 km WNW of Cobb, CA
  14. 2.1 3 km NE of The Geysers, CA
  15. 1.7 19 km NE of Upper 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.

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.