QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

41km NNE of Covelo, CA

· 40 km deep · released about 490 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 57 kmTehama County 71 kmGlenn County 82 kmMendocino County 84 kmHumboldt County 96 kmShasta County 112 kmLake 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 2.8 (md)
Depth
40 km below the surface
Felt
no reports yet
Nearest
Trinity County, 57 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1163 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 490 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 31,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.9× the energy of this one
  4. This earthquake M 2.8 about 490 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 40.1328, -123.0718. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 57 km (36 mi) S of here earthquakes near Trinity County
Tehama County, CA 71 km (44 mi) W of here earthquakes near Tehama County
Glenn County, CA 82 km (51 mi) NW of here earthquakes near Glenn County
Mendocino County, CA 84 km (52 mi) NNE of here earthquakes near Mendocino County
Humboldt County, CA 96 km (60 mi) SE of here earthquakes near Humboldt County
Shasta County, CA 112 km (69 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

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

  1. 2.1 29 km NW of Rancho Tehama Reserve, CA
  2. 2.0 37 km WNW of Rancho Tehama Reserve, CA
  3. 3.0 26 km WSW of Rancho Tehama Reserve, CA
  4. 2.5 41 km ENE of Covelo, CA
  5. 2.4 41 km NNE of Covelo, CA
  6. 2.1 17 km NNE of Laytonville, CA
  7. 2.2 35 km WSW of Hayfork, CA
  8. 3.0 14 km NW of Alder Springs, CA
  9. 1.9 27 km WSW of Hayfork, CA
  10. 2.6 32 km WSW of Hayfork, CA
  11. 2.8 10 km W of Hayfork, CA
  12. 1.6 17 km N of Laytonville, CA
  13. 1.9 25 km WSW of Rancho Tehama Reserve, CA
  14. 1.6 16 km N of Covelo, CA
  15. 2.0 38 km NNW of Alder Springs, 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 4.5 on 2016-08-28 — it released about 330 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.