QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

6km E of Covelo, CA

· 7.5 km deep · released about 700 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 47 kmGlenn County 70 kmLake County 86 kmTehama County 89 kmTrinity County 94 kmColusa County 107 kmHumboldt County 119 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 (ml)
Depth
7.5 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Mendocino County, 47 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1626 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 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 39.8010, -123.1840. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 47 km (29 mi) NNE of here earthquakes near Mendocino County
Glenn County, CA 70 km (44 mi) WNW of here earthquakes near Glenn County
Lake County, CA 86 km (53 mi) NNW of here earthquakes near Lake County
Tehama County, CA 89 km (55 mi) WSW of here earthquakes near Tehama County
Trinity County, CA 94 km (59 mi) S of here earthquakes near Trinity County
Colusa County, CA 107 km (66 mi) NW of here earthquakes near Colusa County

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

Aftershocks so far

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

  1. 1.7 4km E of Willits, CA
  2. 1.6 15km NW of Lake Pillsbury, CA
  3. 1.9 18km NNW of Laytonville, CA
  4. 1.9 7km ENE of Covelo, CA
  5. 1.8 9km NE of Laytonville, CA
  6. 1.6 11km N of Brooktrails, CA
  7. 1.7 24km NNW of Lake Pillsbury, CA
  8. 1.7 10km SSE of Laytonville, CA
  9. 2.0 21km NW of Alder Springs, CA
  10. 1.8 10km ENE of Covelo, CA
  11. 1.6 11km NNE of Brooktrails, CA
  12. 2.4 38km NNE of Covelo, CA
  13. 1.6 8km E of Willits, CA
  14. 2.0 6km NW of Lake Pillsbury, CA
  15. 1.9 14km N of Brooktrails, 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 4.3 on 2017-12-14 — it released about 110 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.