QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

17km S of Weaverville, CA

· 42 km deep · released about 69 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 15 kmTehama County 80 kmShasta County 80 kmHumboldt County 82 kmSiskiyou County 118 kmGlenn County 119 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 2.2 (md)
Depth
42 km below the surface
Felt
no reports yet
Nearest
Trinity County, 15 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1440 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 69 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 220,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 150,000× the energy of this one
  3. Around the size people start to feel M 3.0 14× the energy of this one
  4. This earthquake M 2.2 about 69 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 40.5817, -122.9657. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 15 km (9 mi) ESE of here earthquakes near Trinity County
Tehama County, CA 80 km (50 mi) NW of here earthquakes near Tehama County
Shasta County, CA 80 km (50 mi) WSW of here earthquakes near Shasta County
Humboldt County, CA 82 km (51 mi) E of here earthquakes near Humboldt County
Siskiyou County, CA 118 km (73 mi) SSW of here earthquakes near Siskiyou County
Glenn County, CA 119 km (74 mi) NNW of here earthquakes near Glenn 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. 2.4 28 km WNW of Weaverville, CA
  2. 2.4 44 km S of Hayfork, CA
  3. 2.3 16 km WSW of Hayfork, CA
  4. 3.6 30 km W of Hayfork, CA
  5. 2.2 12 km ENE of Hayfork, CA
  6. 2.0 22 km W of Hayfork, CA
  7. 2.1 5 km SSW of Shasta, CA
  8. 1.8 2 km NNE of Shasta, CA
  9. 2.6 42 km NNE of Covelo, CA
  10. 1.8 11 km of Hayfork, CA
  11. 1.8 2 km NE of Shasta, CA
  12. 2.1 40 km NW of Rancho Tehama Reserve, CA
  13. 2.0 39 km NW of Rancho Tehama Reserve, CA
  14. 1.8 9 km NW of Shasta Lake, CA
  15. 1.9 10 km WNW of Shasta Lake, 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 2,400 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.