QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

41km S of Hayfork, CA

· 33 km deep · released about 85 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 51 kmTehama County 77 kmMendocino County 88 kmHumboldt County 89 kmGlenn County 90 kmShasta County 112 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 2.3 (md)
Depth
33 km below the surface
Felt
no reports yet
Nearest
Trinity County, 51 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1705 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 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 40.1887, -123.1298. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 51 km (32 mi) S of here earthquakes near Trinity County
Tehama County, CA 77 km (48 mi) W of here earthquakes near Tehama County
Mendocino County, CA 88 km (55 mi) NNE of here earthquakes near Mendocino County
Humboldt County, CA 89 km (55 mi) SE of here earthquakes near Humboldt County
Glenn County, CA 90 km (56 mi) NW of here earthquakes near Glenn County
Shasta County, CA 112 km (69 mi) SW of here earthquakes near Shasta County

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

Aftershocks so far

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

  1. 2.0 6km E of Covelo, CA
  2. 2.6 6km ENE of Covelo, CA
  3. 2.1 6km E of Covelo, CA
  4. 4.0 5km E of Covelo, CA
  5. 1.5 29km NNE of Redway, CA
  6. 2.0 9km WNW of Covelo, CA
  7. 1.7 31km W of Hayfork, CA
  8. 2.0 40km SSW of Hayfork, CA
  9. 2.5 27km WSW of Hayfork, CA
  10. 2.0 44km NW of Rancho Tehama Reserve, CA
  11. 1.8 40km NW of Rancho Tehama Reserve, CA
  12. 2.6 6km NNW of Hayfork, CA
  13. 1.9 7km ENE of Covelo, CA
  14. 2.6 18km ESE of Hayfork, CA
  15. 2.0 21km NW 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.5 on 2016-08-28 — it released about 1,900 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.