QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

32km SSW of Hayfork, CA

· 33 km deep · released about 780 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 44 kmHumboldt County 66 kmMendocino County 96 kmTehama County 98 kmGlenn County 113 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 2.9 (md)
Depth
33 km below the surface
Felt
no reports yet
Nearest
Trinity County, 44 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2207 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 780 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 19,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 14,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.2× the energy of this one
  4. This earthquake M 2.9 about 780 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 40.2972, -123.3637. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 44 km (28 mi) SSW of here earthquakes near Trinity County
Humboldt County, CA 66 km (41 mi) SE of here earthquakes near Humboldt County
Mendocino County, CA 96 km (60 mi) N of here earthquakes near Mendocino County
Tehama County, CA 98 km (61 mi) WNW of here earthquakes near Tehama County
Glenn County, CA 113 km (70 mi) NW of here earthquakes near Glenn County
Shasta County, CA 123 km (76 mi) WSW of here earthquakes near Shasta County

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

Aftershocks so far

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

  1. 2.0 3km SE of Redway, CA
  2. 2.1 28km ENE of Redway, CA
  3. 2.1 23km NNE of Redway, CA
  4. 3.7 30km NNE of Redway, CA
  5. 1.8 6km ESE of Redway, CA
  6. 2.4 8km WNW of Hayfork, CA
  7. 1.6 19km NE of Covelo, CA
  8. 2.2 12km WNW of Covelo, CA
  9. 2.7 12km WNW of Covelo, CA
  10. 2.1 34km NE of Redway, CA
  11. 2.3 29km W of Hayfork, CA
  12. 1.7 12km NW of Covelo, CA
  13. 1.7 12km WNW of Covelo, CA
  14. 1.5 13km NW of Covelo, CA
  15. 1.6 13km NW of Covelo, 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 210 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.