QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8mw

12 km NNE of Covelo, CA

· 10 km deep · released about 6.8 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 56 kmGlenn County 77 kmTrinity County 84 kmTehama County 87 kmLake County 97 kmHumboldt County 108 kmColusa County 116 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 3.8 (mw)
Depth
10 km below the surface
Felt
14 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Mendocino County, 56 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 66 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 14 people have reported feeling it to USGS.

How big was it?

This earthquake released about 6.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 25,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 790× the energy of this one
  4. This earthquake M 3.8 about 6.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 14× more

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 39.8992, -123.2117. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 56 km (35 mi) NNE of here earthquakes near Mendocino County
Glenn County, CA 77 km (48 mi) WNW of here earthquakes near Glenn County
Trinity County, CA 84 km (52 mi) S of here earthquakes near Trinity County
Tehama County, CA 87 km (54 mi) WSW of here earthquakes near Tehama County
Lake County, CA 97 km (60 mi) NNW of here earthquakes near Lake County
Humboldt County, CA 108 km (67 mi) SE of here earthquakes near Humboldt County

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

Aftershocks so far

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

  1. 1.4 13 km SSE of Redway, CA
  2. 2.2 25 km NW of Alder Springs, CA
  3. 1.9 9 km ENE of Brooktrails, CA
  4. 1.8 7 km E of Covelo, CA
  5. 1.8 10 km N of Lake Pillsbury, CA
  6. 1.9 10 km ENE of Rockport, CA
  7. 1.7 10 km ENE of Rockport, CA
  8. 2.7 32 km NNW of Covelo, CA
  9. 1.9 8 km N of Covelo, CA
  10. 2.6 32 km NW of Covelo, CA
  11. 1.6 41 km WNW of Rancho Tehama Reserve, CA
  12. 3.2 31 km NNW of Covelo, CA
  13. 1.8 10 km N of Covelo, CA
  14. 2.2 30 km NNW of Covelo, CA
  15. 1.8 4 km W 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 4.3 on 2024-06-22 — it released about 7.2 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.