QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

26km ESE of Willow Creek, CA

· 23 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 29 kmHumboldt County 50 kmSiskiyou County 109 kmShasta County 111 kmDel Norte County 114 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 2.1 (md)
Depth
23 km below the surface
Felt
no reports yet
Nearest
Trinity County, 29 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2165 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 51 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 51 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 40.8332, -123.3605. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 29 km (18 mi) NW of here earthquakes near Trinity County
Humboldt County, CA 50 km (31 mi) ENE of here earthquakes near Humboldt County
Siskiyou County, CA 109 km (68 mi) SW of here earthquakes near Siskiyou County
Shasta County, CA 111 km (69 mi) W of here earthquakes near Shasta County
Del Norte County, CA 114 km (71 mi) SSE of here earthquakes near Del Norte County
Tehama County, CA 124 km (77 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. 2.2 22km SSE of Willow Creek, CA
  2. 2.3 22km SSE of Willow Creek, CA
  3. 2.2 22km SSE of Willow Creek, CA
  4. 3.5 16km NE of Willow Creek, CA
  5. 3.0 19km SE of Willow Creek, CA
  6. 2.4 11km WSW of Willow Creek, CA
  7. 2.2 24km NW of Hayfork, CA
  8. 2.9 29km ENE of Willow Creek, CA
  9. 2.3 10km SE of Willow Creek, CA
  10. 2.5 9km NNE of Hayfork, CA
  11. 2.2 9km ESE of Willow Creek, CA
  12. 2.4 21km SSE of Willow Creek, CA
  13. 2.5 16km SSE of Somes Bar, CA
  14. 2.5 8km E of Willow Creek, CA
  15. 2.0 18km ESE 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 9,800 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.