QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

18km NNE of Nice, CA

· 11 km deep · released about 91 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 17 kmColusa County 44 kmGlenn County 48 kmMendocino County 64 kmSonoma County 83 kmNapa County 91 kmSutter County 92 kmYolo County 97 kmTehama County 106 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
11 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Lake County, 17 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2070 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 91 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 5.8 170,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 120,000× the energy of this one
  3. Around the size people start to feel M 3.0 10× the energy of this one
  4. This earthquake M 2.3 about 91 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 39.2580, -122.7368. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 17 km (10 mi) N of here earthquakes near Lake County
Colusa County, CA 44 km (27 mi) WNW of here earthquakes near Colusa County
Glenn County, CA 48 km (30 mi) SW of here earthquakes near Glenn County
Mendocino County, CA 64 km (40 mi) ESE of here earthquakes near Mendocino County
Sonoma County, CA 83 km (52 mi) NNE of here earthquakes near Sonoma County
Napa County, CA 91 km (56 mi) NNW of here earthquakes near Napa County

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

Aftershocks so far

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

  1. 2.0 8km W of Cobb, CA
  2. 2.2 10km N of Cloverdale, CA
  3. 1.6 5km WNW of Cobb, CA
  4. 2.3 5km WNW of Cobb, CA
  5. 1.8 8km NW of The Geysers, CA
  6. 1.6 5km NW of The Geysers, CA
  7. 1.6 7km NW of The Geysers, CA
  8. 3.8 7km NW of The Geysers, CA
  9. 1.7 8km NW of The Geysers, CA
  10. 1.6 5km N of Lake Pillsbury, CA
  11. 2.2 8km WNW of Cobb, CA
  12. 1.6 8km NW of The Geysers, CA
  13. 1.5 4km W of Cobb, CA
  14. 1.8 6km WNW of Cobb, CA
  15. 1.5 5km E of Clearlake Oaks, 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 5.1 on 2016-08-10 — it released about 14,000 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.