QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

25km WNW of Weaverville, CA

· 28 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 24 kmHumboldt County 64 kmShasta County 97 kmSiskiyou County 99 kmTehama County 115 kmDel Norte County 120 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
28 km below the surface
Felt
no reports yet
Nearest
Trinity County, 24 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1472 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 40 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 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 40.8520, -123.1948. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 24 km (15 mi) NNW of here earthquakes near Trinity County
Humboldt County, CA 64 km (40 mi) ENE of here earthquakes near Humboldt County
Shasta County, CA 97 km (61 mi) W of here earthquakes near Shasta County
Siskiyou County, CA 99 km (61 mi) SW of here earthquakes near Siskiyou County
Tehama County, CA 115 km (71 mi) NW of here earthquakes near Tehama County
Del Norte County, CA 120 km (74 mi) SSE of here earthquakes near Del Norte County

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

Aftershocks so far

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

  1. 2.0 22 km W of Hayfork, CA
  2. 1.8 11 km of Hayfork, CA
  3. 2.1 18 km S of Willow Creek, CA
  4. 2.3 3 km ESE of Willow Creek, CA
  5. 2.0 14 km SSE of Hayfork, CA
  6. 2.4 19 km ENE of Willow Creek, CA
  7. 2.2 21 km W of Hayfork, CA
  8. 2.0 25 km WNW of Hayfork, CA
  9. 2.0 25 km ESE of Willow Creek, CA
  10. 2.9 31 km E of Willow Creek, CA
  11. 2.5 26 km WSW of Hayfork, CA
  12. 2.6 21 km SSE of Somes Bar, CA
  13. 2.3 26 km E of Willow Creek, CA
  14. 2.4 30 km SSE of Somes Bar, CA
  15. 2.4 16 km NW 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 4.5 on 2016-08-28 — it released about 4,100 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.