QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

8km E of Clearlake Oaks, CA

· 2.1 km deep · released about 700 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 17 kmColusa County 34 kmNapa County 62 kmSonoma County 63 kmGlenn County 66 kmYolo County 70 kmSutter County 76 kmMendocino County 87 kmSolano County 101 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 2.9 (md)
Depth
2.1 km below the surface
Felt
3 reports · strongest reported intensity III
Nearest
Lake County, 17 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3077 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 700 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 15,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 700 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 39.0260, -122.5780. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 17 km (11 mi) ESE of here earthquakes near Lake County
Colusa County, CA 34 km (21 mi) WSW of here earthquakes near Colusa County
Napa County, CA 62 km (38 mi) NNW of here earthquakes near Napa County
Sonoma County, CA 63 km (39 mi) NNE of here earthquakes near Sonoma County
Glenn County, CA 66 km (41 mi) SSW of here earthquakes near Glenn County
Yolo County, CA 70 km (44 mi) WNW of here earthquakes near Yolo County

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

Aftershocks so far

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

  1. 3.1 3km NW of The Geysers, CA
  2. 4.2 5km NW of The Geysers, CA
  3. 1.6 3km WNW of The Geysers, CA
  4. 1.8 7km WNW of The Geysers, CA
  5. 1.6 18km NE of Upper Lake, CA
  6. 1.7 7km NW of The Geysers, CA
  7. 2.0 7km NW of The Geysers, CA
  8. 2.0 7km NW of The Geysers, CA
  9. 1.8 6km WNW of The Geysers, CA
  10. 1.6 3km W of Cobb, CA
  11. 1.7 8km SE of Lake Pillsbury, CA
  12. 1.7 6km WNW of The Geysers, CA
  13. 1.8 6km WNW of Cobb, CA
  14. 1.5 6km NW of The Geysers, CA
  15. 2.6 6km WNW 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 5.1 on 2016-08-10 — it released about 1,900 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.