QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

21km SE of Covelo, CA

· 3.4 km deep · released about 310 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 37 kmGlenn County 60 kmLake County 67 kmColusa County 90 kmTehama County 92 kmTrinity County 112 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 2.7 (md)
Depth
3.4 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 37 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2704 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 310 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 50,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 35,000× the energy of this one
  3. Around the size people start to feel M 3.0 3.1× the energy of this one
  4. This earthquake M 2.7 about 310 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 39.6412, -123.1003. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 37 km (23 mi) NE of here earthquakes near Mendocino County
Glenn County, CA 60 km (37 mi) W of here earthquakes near Glenn County
Lake County, CA 67 km (41 mi) NNW of here earthquakes near Lake County
Colusa County, CA 90 km (56 mi) NW of here earthquakes near Colusa County
Tehama County, CA 92 km (57 mi) SW of here earthquakes near Tehama County
Trinity County, CA 112 km (70 mi) S of here earthquakes near Trinity 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. 1.8 10km NNW of Redwood Valley, CA
  2. 2.5 11km SW of Lake Pillsbury, CA
  3. 1.5 11km N of Redwood Valley, CA
  4. 1.6 12km N of Brooktrails, CA
  5. 1.8 10km NNW of Redwood Valley, CA
  6. 1.7 9km NNW of Lake Pillsbury, CA
  7. 1.5 14km SE of Covelo, CA
  8. 1.9 8km NE of Willits, CA
  9. 1.5 11km SE of Willits, CA
  10. 1.5 24km NNW of Lake Pillsbury, CA
  11. 2.2 9km SSE of Willits, CA
  12. 1.5 10km NNW of Redwood Valley, CA
  13. 2.0 9km NNW of Redwood Valley, CA
  14. 1.6 23km NNW of Lake Pillsbury, CA
  15. 1.6 11km NNW of Redwood Valley, 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 4,300 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.