QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

18km E of Willow Creek, CA

· 25 km deep · released about 85 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 42 kmHumboldt County 51 kmDel Norte County 100 kmSiskiyou County 102 kmShasta County 118 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
25 km below the surface
Felt
no reports yet
Nearest
Trinity County, 42 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1822 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 40.9532, -123.4173. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 42 km (26 mi) NW of here earthquakes near Trinity County
Humboldt County, CA 51 km (32 mi) ENE of here earthquakes near Humboldt County
Del Norte County, CA 100 km (62 mi) SSE of here earthquakes near Del Norte County
Siskiyou County, CA 102 km (63 mi) SW of here earthquakes near Siskiyou County
Shasta County, CA 118 km (73 mi) W of here earthquakes near Shasta County
Tehama County, CA 136 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

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

  1. 2.5 24km SE of Blue Lake, CA
  2. 2.1 28km WNW of Hayfork, CA
  3. 2.3 15km E of Willow Creek, CA
  4. 2.4 17km ENE of Willow Creek, CA
  5. 1.8 20km SSE of Willow Creek, CA
  6. 2.1 25km WNW of Weaverville, CA
  7. 2.0 7km W of Willow Creek, CA
  8. 2.4 14km E of Willow Creek, CA
  9. 2.3 28km ENE of Willow Creek, CA
  10. 2.1 26km ESE of Willow Creek, CA
  11. 2.4 7km S of Somes Bar, CA
  12. 2.3 15km SE of Bayside, CA
  13. 3.6 14km SE of Bayside, CA
  14. 3.2 16km WSW of Weitchpec, CA
  15. 1.6 29km 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 5,800 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.