QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

34km ENE of Covelo, CA

· 25 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 58 kmTehama County 60 kmMendocino County 74 kmTrinity County 80 kmLake County 95 kmColusa County 103 kmButte County 115 kmShasta 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 1.8 (md)
Depth
25 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Glenn County, 58 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2794 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 39.9497, -122.9023. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 58 km (36 mi) NW of here earthquakes near Glenn County
Tehama County, CA 60 km (37 mi) WSW of here earthquakes near Tehama County
Mendocino County, CA 74 km (46 mi) NE of here earthquakes near Mendocino County
Trinity County, CA 80 km (50 mi) SSE of here earthquakes near Trinity County
Lake County, CA 95 km (59 mi) N of here earthquakes near Lake County
Colusa County, CA 103 km (64 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

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

  1. 1.9 5km NNE of Alder Springs, CA
  2. 1.6 11km NNW of Covelo, CA
  3. 2.4 12km NNW of Covelo, CA
  4. 1.8 14km NE of Covelo, CA
  5. 1.5 16km N of Lake Pillsbury, CA
  6. 1.7 12km NNW of Stony Gorge Reservoir, CA
  7. 1.8 41km NE of Covelo, CA
  8. 1.7 41km NE of Covelo, CA
  9. 1.7 16km NW of Alder Springs, CA
  10. 1.8 36km NE of Covelo, CA
  11. 2.6 41km S of Hayfork, CA
  12. 2.7 37km SSE of Hayfork, CA
  13. 1.5 41km NE of Covelo, CA
  14. 2.9 15km N of Lake Pillsbury, CA
  15. 1.9 21km W 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.