QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

37km WNW of Rancho Tehama Reserve, CA

· 5.0 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 50 kmTrinity County 65 kmGlenn County 66 kmMendocino County 92 kmShasta County 98 kmLake County 111 kmColusa County 115 kmButte County 115 kmHumboldt County 115 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
5.0 km below the surface
Felt
no reports yet
Nearest
Tehama County, 50 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2979 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 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 40.1035, -122.8233. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 50 km (31 mi) W of here earthquakes near Tehama County
Trinity County, CA 65 km (41 mi) SSE of here earthquakes near Trinity County
Glenn County, CA 66 km (41 mi) NNW of here earthquakes near Glenn County
Mendocino County, CA 92 km (57 mi) NE of here earthquakes near Mendocino County
Shasta County, CA 98 km (61 mi) SW of here earthquakes near Shasta County
Lake County, CA 111 km (69 mi) N of here earthquakes near Lake County

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

Aftershocks so far

54 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. 1.8 41km NE of Covelo, CA
  6. 1.7 41km NE of Covelo, CA
  7. 1.7 16km NW of Alder Springs, CA
  8. 1.8 36km NE of Covelo, CA
  9. 2.6 41km S of Hayfork, CA
  10. 2.7 37km SSE of Hayfork, CA
  11. 1.5 41km NE of Covelo, CA
  12. 1.9 21km W of Rancho Tehama Reserve, CA
  13. 1.7 8km ENE of Covelo, CA
  14. 1.9 19km NNW of Alder Springs, CA
  15. 1.8 20km NNW of Alder Springs, 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.