QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

36km NE of Covelo, CA

· 5.8 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 60 kmGlenn County 61 kmTrinity County 76 kmMendocino County 76 kmLake County 99 kmColusa County 107 kmShasta County 113 kmHumboldt County 117 kmButte 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
5.8 km below the surface
Felt
no reports yet
Nearest
Tehama County, 60 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1409 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× 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 39.9850, -122.9143. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 60 km (37 mi) WSW of here earthquakes near Tehama County
Glenn County, CA 61 km (38 mi) NW of here earthquakes near Glenn County
Trinity County, CA 76 km (47 mi) SSE of here earthquakes near Trinity County
Mendocino County, CA 76 km (47 mi) NE of here earthquakes near Mendocino County
Lake County, CA 99 km (61 mi) N of here earthquakes near Lake County
Colusa County, CA 107 km (66 mi) NNW of here earthquakes near Colusa County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.5 18 km N of Alder Springs, CA
  2. 1.7 16 km N of Covelo, CA
  3. 1.7 16 km N of Covelo, CA
  4. 1.5 34 km NE of Covelo, CA
  5. 2.1 15 km N of Covelo, CA
  6. 2.1 15 km N of Covelo, CA
  7. 2.3 15 km N of Covelo, CA
  8. 2.5 40 km NNE of Covelo, CA
  9. 2.0 15 km N of Covelo, CA
  10. 1.8 14 km N of Covelo, CA
  11. 1.6 15 km N of Covelo, CA
  12. 2.4 15 km N of Covelo, CA
  13. 1.8 15 km N of Covelo, CA
  14. 1.8 26 km SSW of Hayfork, CA
  15. 1.5 13 km NNE of Laytonville, 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 3,000 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.