QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

40km NE of Covelo, CA

· -0.5 km deep · released about 400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 58 kmGlenn County 64 kmTrinity County 71 kmMendocino County 81 kmLake County 103 kmShasta County 109 kmColusa County 110 kmHumboldt County 115 kmButte County 118 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 2.8 (md)
Depth
-0.5 km below the surface
Felt
no reports yet
Nearest
Tehama County, 58 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3155 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 400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 38,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 27,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.4× the energy of this one
  4. This earthquake M 2.8 about 400 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 40.0273, -122.8997. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 58 km (36 mi) W of here earthquakes near Tehama County
Glenn County, CA 64 km (39 mi) NW of here earthquakes near Glenn County
Trinity County, CA 71 km (44 mi) SSE of here earthquakes near Trinity County
Mendocino County, CA 81 km (50 mi) NE of here earthquakes near Mendocino County
Lake County, CA 103 km (64 mi) N of here earthquakes near Lake County
Shasta County, CA 109 km (68 mi) SW of here earthquakes near Shasta 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. 1.9 36km SSE of Hayfork, CA
  2. 1.6 18km NNW of Covelo, CA
  3. 1.6 25km W of Rancho Tehama Reserve, CA
  4. 1.8 37km NNW of Alder Springs, CA
  5. 1.7 5km WNW of Covelo, CA
  6. 1.7 15km N of Alder Springs, CA
  7. 2.0 44km NNE of Covelo, CA
  8. 2.0 38km S of Hayfork, CA
  9. 2.1 38km S of Hayfork, CA
  10. 2.1 42km NNE of Covelo, CA
  11. 1.9 25km SE of Hayfork, CA
  12. 2.5 40km SSE of Hayfork, CA
  13. 2.3 38km SSE of Hayfork, CA
  14. 1.8 38km W of Rancho Tehama Reserve, CA
  15. 1.8 37km WNW of Rancho Tehama Reserve, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.