QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

31 km E of Willow Creek, CA

· 36 km deep · released about 720 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 41 kmHumboldt County 64 kmSiskiyou County 90 kmDel Norte County 103 kmShasta County 107 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
36 km below the surface
Felt
2 reports · strongest reported intensity I
Nearest
Trinity County, 41 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 765 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 720 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 21,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 15,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.3× the energy of this one
  4. This earthquake M 2.9 about 720 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 40.9958, -123.2717. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 41 km (25 mi) NNW of here earthquakes near Trinity County
Humboldt County, CA 64 km (40 mi) ENE of here earthquakes near Humboldt County
Siskiyou County, CA 90 km (56 mi) SW of here earthquakes near Siskiyou County
Del Norte County, CA 103 km (64 mi) SE of here earthquakes near Del Norte County
Shasta County, CA 107 km (66 mi) WNW of here earthquakes near Shasta County
Tehama County, CA 131 km (81 mi) NW of here earthquakes near Tehama County

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

Aftershocks so far

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

  1. 1.9 12 km WNW of Hayfork, CA
  2. 2.8 24 km WNW of Weaverville, CA
  3. 2.3 4 km NNE of Hayfork, CA
  4. 2.7 33 km SSE of Somes Bar, CA
  5. 2.4 20 km ENE of Willow Creek, CA
  6. 2.3 21 km E of Willow Creek, CA
  7. 1.9 25 km SSW of Willow Creek, CA
  8. 2.0 10 km WSW of Willow Creek, CA
  9. 2.4 8 km SSE of Weitchpec, CA
  10. 1.9 23 km SSW of Willow Creek, CA
  11. 2.6 27 km ENE of Willow Creek, CA
  12. 2.8 8 km E of Willow Creek, CA
  13. 3.1 23 km NNW of Hayfork, CA
  14. 1.8 10 km SW of Willow Creek, CA
  15. 2.1 22 km NNW of Hayfork, 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.