QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

8 km ENE of Covelo, California

· 11 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 50 kmGlenn County 70 kmTehama County 86 kmLake County 88 kmTrinity County 91 kmColusa County 107 kmHumboldt County 117 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 1.8 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 50 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3249 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 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 39.8265, -123.1635. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 50 km (31 mi) NNE of here earthquakes near Mendocino County
Glenn County, CA 70 km (43 mi) WNW of here earthquakes near Glenn County
Tehama County, CA 86 km (53 mi) WSW of here earthquakes near Tehama County
Lake County, CA 88 km (54 mi) NNW of here earthquakes near Lake County
Trinity County, CA 91 km (57 mi) S of here earthquakes near Trinity County
Colusa County, CA 107 km (67 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

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

  1. 1.9 37km W of Rancho Tehama Reserve, CA
  2. 1.7 38km NNW of Alder Springs, CA
  3. 2.0 2km NNE of Willits, CA
  4. 1.9 28km NW of Alder Springs, CA
  5. 2.4 41km NE of Covelo, CA
  6. 1.6 15km WNW of Brooktrails, CA
  7. 1.9 32km NNW of Alder Springs, CA
  8. 2.2 16km WNW of Lake Pillsbury, CA
  9. 1.6 32km NNW of Alder Springs, CA
  10. 2.0 25km W of Alder Springs, CA
  11. 1.8 39km NE of Covelo, CA
  12. 1.6 39km NE of Covelo, CA
  13. 1.7 39km NE of Covelo, CA
  14. 2.8 40km NE of Covelo, CA
  15. 2.5 4km E of Covelo, 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 4.1 on 2016-11-06 — it released about 2,900 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.