QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

29 km ENE of Covelo, California

· -0.9 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 57 kmTehama County 65 kmMendocino County 69 kmTrinity County 83 kmLake County 91 kmColusa County 101 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
-0.9 km below the surface
Felt
no reports yet
Nearest
Glenn County, 57 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3515 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 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 39.9130, -122.9390. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 57 km (36 mi) NW of here earthquakes near Glenn County
Tehama County, CA 65 km (40 mi) WSW of here earthquakes near Tehama County
Mendocino County, CA 69 km (43 mi) NE of here earthquakes near Mendocino County
Trinity County, CA 83 km (52 mi) S of here earthquakes near Trinity County
Lake County, CA 91 km (57 mi) N of here earthquakes near Lake County
Colusa County, CA 101 km (63 mi) NW of here earthquakes near Colusa County

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

Aftershocks so far

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

  1. 2.3 5 km WNW of Covelo, California
  2. 1.6 24 km NE of Potter Valley, California
  3. 1.7 25 km SE of Covelo, California
  4. 1.6 5 km WNW of Covelo, California
  5. 1.6 17 km NW of Paskenta, California
  6. 2.0 4 km WSW of Flournoy, California
  7. 2.0 32 km ESE of Ruth, California
  8. 1.7 5 km WNW of Covelo, California
  9. 1.8 5 km WNW of Covelo, California
  10. 2.0 5 km WNW of Covelo, California
  11. 1.6 28 km WSW of Paskenta, California
  12. 1.7 24 km SE of Alderpoint, California
  13. 1.7 28 km WSW of Paskenta, California
  14. 2.1 28 km WSW of Paskenta, California
  15. 1.5 25 km NNE of Potter Valley, California

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.