QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

28km NW of Hayfork, CA

· 34 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 26 kmHumboldt County 45 kmShasta County 114 kmSiskiyou 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 2.1 (md)
Depth
34 km below the surface
Felt
no reports yet
Nearest
Trinity County, 26 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2196 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 43 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 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 40.7487, -123.3943. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 26 km (16 mi) WNW of here earthquakes near Trinity County
Humboldt County, CA 45 km (28 mi) E of here earthquakes near Humboldt County
Shasta County, CA 114 km (71 mi) W of here earthquakes near Shasta County
Siskiyou County, CA 118 km (73 mi) SW of here earthquakes near Siskiyou County
Tehama County, CA 120 km (75 mi) NW of here earthquakes near Tehama County
Del Norte County, CA 122 km (76 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

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

  1. 2.4 21km SSE of Willow Creek, CA
  2. 2.5 8km E of Willow Creek, CA
  3. 2.0 18km ESE of Willow Creek, CA
  4. 2.3 20km ENE of Willow Creek, CA
  5. 2.3 18km E of Willow Creek, CA
  6. 2.4 12km SE of Weitchpec, CA
  7. 2.3 15km W of Weaverville, CA
  8. 2.4 32km W of Hayfork, CA
  9. 2.3 8km E of Willow Creek, CA
  10. 1.7 33km ENE of Hydesville, CA
  11. 2.5 19km SE of Bayside, CA
  12. 2.1 24km WNW of Weaverville, CA
  13. 1.8 9km W of Willow Creek, CA
  14. 2.4 36km NNE of Redway, CA
  15. 2.2 20km SE 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 12,000 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.