QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

40km NE of Covelo, CA

· 2.3 km deep · released about 41 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 59 kmGlenn County 66 kmTrinity County 69 kmMendocino County 82 kmLake County 106 kmShasta County 109 kmHumboldt County 112 kmColusa County 113 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 2.1 (md)
Depth
2.3 km below the surface
Felt
no reports yet
Nearest
Tehama County, 59 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1251 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 41 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 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 40.0478, -122.9195. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 59 km (37 mi) W of here earthquakes near Tehama County
Glenn County, CA 66 km (41 mi) NW of here earthquakes near Glenn County
Trinity County, CA 69 km (43 mi) SSE of here earthquakes near Trinity County
Mendocino County, CA 82 km (51 mi) NNE of here earthquakes near Mendocino County
Lake County, CA 106 km (66 mi) N of here earthquakes near Lake County
Shasta County, CA 109 km (67 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

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

  1. 1.7 11 km WNW of Alder Springs, CA
  2. 1.6 24 km NNW of Alder Springs, CA
  3. 2.1 40 km NW of Rancho Tehama Reserve, CA
  4. 2.0 21 km NNE of Alder Springs, CA
  5. 2.1 32 km of Alder Springs, CA
  6. 1.6 12 km NE of Covelo, CA
  7. 1.8 31 km of Alder Springs, CA
  8. 1.8 12 km SSE of Covelo, CA
  9. 2.0 39 km NW of Rancho Tehama Reserve, CA
  10. 2.2 43 km NW of Rancho Tehama Reserve, CA
  11. 2.0 14 km SSE of Hayfork, CA
  12. 1.5 14 km NE of Covelo, CA
  13. 1.7 15 km N of Covelo, CA
  14. 1.6 16 km N of Covelo, CA
  15. 2.1 29 km NW 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.1 on 2021-11-04 — it released about 970 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.