QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

26 km NNW of Covelo, California

· 0.9 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 64 kmTrinity County 75 kmHumboldt County 90 kmGlenn County 95 kmTehama County 99 kmLake County 114 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
Mendocino County, 64 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3462 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 14 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 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 40.0058, -123.3870. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 64 km (40 mi) N of here earthquakes near Mendocino County
Trinity County, CA 75 km (47 mi) SSW of here earthquakes near Trinity County
Humboldt County, CA 90 km (56 mi) SSE of here earthquakes near Humboldt County
Glenn County, CA 95 km (59 mi) WNW of here earthquakes near Glenn County
Tehama County, CA 99 km (62 mi) W of here earthquakes near Tehama County
Lake County, CA 114 km (71 mi) NNW of here earthquakes near Lake 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. 2.2 12 km N of Brooktrails, California
  2. 1.8 8 km ENE of Covelo, California
  3. 1.5 27 km WNW of Paskenta, California
  4. 1.5 4 km NNW of Covelo, California
  5. 1.6 13 km SSE of Laytonville, California
  6. 1.6 13 km SSE of Laytonville, California
  7. 1.7 14 km NNE of Brooktrails, California
  8. 1.7 5 km NW of Covelo, California
  9. 1.6 near the coast of Northern California
  10. 2.4 5 km WNW of Covelo, California
  11. 2.4 5 km WNW of Covelo, California
  12. 1.9 5 km WNW of Covelo, California
  13. 1.6 30 km WNW of Paskenta, California
  14. 1.5 28 km W of Paskenta, California
  15. 1.6 28 km W of Paskenta, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.5 on 2016-08-28 — it released about 12,000 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.