QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

27km WNW of Hayfork, CA

· 29 km deep · released about 990 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 32 kmHumboldt County 38 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 3.0 (ml)
Depth
29 km below the surface
Felt
no reports yet
Nearest
Trinity County, 32 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2459 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 990 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 340,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 990 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 40.6312, -123.4878. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 32 km (20 mi) W of here earthquakes near Trinity County
Humboldt County, CA 38 km (24 mi) ESE of here earthquakes near Humboldt County
Tehama County, CA 120 km (75 mi) WNW of here earthquakes near Tehama County
Siskiyou County, CA 133 km (83 mi) SW of here earthquakes near Siskiyou County
Glenn County, CA 147 km (91 mi) NW of here earthquakes near Glenn County

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

Aftershocks so far

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

  1. 2.4 20km NE of Willow Creek, CA
  2. 2.1 9km NW of Willow Creek, CA
  3. 2.3 15km WSW of Willow Creek, CA
  4. 2.1 28km ENE of Redway, CA
  5. 2.1 26km ESE of Willow Creek, CA
  6. 2.1 23km NNE of Redway, CA
  7. 3.7 30km NNE of Redway, CA
  8. 2.4 8km WNW of Hayfork, CA
  9. 2.1 34km NE of Redway, CA
  10. 2.3 29km W of Hayfork, CA
  11. 2.1 28km NW of Hayfork, CA
  12. 2.1 23km SSW of Willow Creek, CA
  13. 1.8 24km ENE of Hydesville, CA
  14. 1.7 14km ESE of Pine Hills, CA
  15. 1.8 13km E of Willow Creek, 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 4.8 on 2016-07-21 — it released about 500 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.