QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

14km ESE of Willow Creek, CA

· 23 km deep · released about 1.2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 41 kmHumboldt County 43 kmDel Norte County 105 kmSiskiyou County 111 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 3.3 (ml)
Depth
23 km below the surface
Felt
16 reports · strongest reported intensity III
Nearest
Trinity County, 41 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2759 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 16 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 140,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,600× the energy of this one
  4. This earthquake M 3.3 about 1.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.5× more

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 40.8870, -123.4777. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 41 km (25 mi) NW of here earthquakes near Trinity County
Humboldt County, CA 43 km (27 mi) ENE of here earthquakes near Humboldt County
Del Norte County, CA 105 km (65 mi) SSE of here earthquakes near Del Norte County
Siskiyou County, CA 111 km (69 mi) SW of here earthquakes near Siskiyou County
Tehama County, CA 135 km (84 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

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

  1. 2.3 27km SE of Willow Creek, CA
  2. 2.1 7km SE of Willow Creek, CA
  3. 2.3 26km WSW of Hayfork, CA
  4. 1.8 19km E of Willow Creek, CA
  5. 1.9 6km N of Hayfork, CA
  6. 2.2 18km E of Willow Creek, CA
  7. 2.8 22km NE of Willow Creek, CA
  8. 2.6 21km NE of Willow Creek, CA
  9. 1.6 28km W of Hayfork, CA
  10. 2.3 11km NNW of Weitchpec, CA
  11. 1.9 7km N of Hayfork, CA
  12. 2.6 17km SSE of Blue Lake, CA
  13. 2.9 18km ESE of Weitchpec, CA
  14. 2.4 16km SW of Willow Creek, CA
  15. 2.2 37km W 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.8 on 2016-07-21 — 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.