QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

24km WNW of Weaverville, CA

· 32 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 17 kmHumboldt County 60 kmShasta County 99 kmSiskiyou County 107 kmTehama County 110 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
32 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Trinity County, 17 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1911 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

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 40.7745, -123.2178. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 17 km (10 mi) NNW of here earthquakes near Trinity County
Humboldt County, CA 60 km (37 mi) E of here earthquakes near Humboldt County
Shasta County, CA 99 km (61 mi) W of here earthquakes near Shasta County
Siskiyou County, CA 107 km (67 mi) SSW of here earthquakes near Siskiyou County
Tehama County, CA 110 km (68 mi) NW of here earthquakes near Tehama County
Del Norte County, CA 126 km (78 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

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

  1. 2.5 8km W of Willow Creek, CA
  2. 2.4 17km E of Willow Creek, CA
  3. 2.2 20km WSW of Hayfork, CA
  4. 2.9 5km N of Willow Creek, CA
  5. 2.1 29km E of Willow Creek, CA
  6. 2.7 21km ESE of Weitchpec, CA
  7. 2.1 36km W of Hayfork, CA
  8. 2.1 28km WNW of Hayfork, CA
  9. 2.3 15km E of Willow Creek, CA
  10. 2.2 17km S of Weaverville, CA
  11. 2.4 17km ENE of Willow Creek, CA
  12. 1.6 31km WSW of Hayfork, CA
  13. 1.8 20km SSE of Willow Creek, CA
  14. 2.1 25km WNW of Weaverville, CA
  15. 2.0 7km W 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 4.5 on 2016-08-28 — it released about 3,200 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.