QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

30 km WNW of Hayfork, CA

· 30 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 33 kmHumboldt County 36 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
30 km below the surface
Felt
no reports yet
Nearest
Trinity County, 33 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1111 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 40.6447, -123.5115. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 33 km (21 mi) W of here earthquakes near Trinity County
Humboldt County, CA 36 km (22 mi) E of here earthquakes near Humboldt County
Tehama County, CA 123 km (76 mi) WNW of here earthquakes near Tehama County
Siskiyou County, CA 133 km (83 mi) SW of here earthquakes near Siskiyou County
Glenn County, CA 149 km (93 mi) NW of here earthquakes near Glenn 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. 2.3 3 km ESE of Willow Creek, CA
  2. 1.6 26 km SE of Rio Dell, CA
  3. 2.0 14 km SSE of Hayfork, CA
  4. 2.4 19 km ENE of Willow Creek, CA
  5. 2.2 21 km W of Hayfork, CA
  6. 2.0 25 km WNW of Hayfork, CA
  7. 1.7 10 km SE of Rio Dell, CA
  8. 1.6 37 km ESE of Hydesville, CA
  9. 2.0 25 km ESE of Willow Creek, CA
  10. 1.5 23 km NNE of Redway, CA
  11. 1.9 32 km E of Hydesville, CA
  12. 1.8 28 km ESE of Rio Dell, CA
  13. 1.7 33 km W of Hayfork, CA
  14. 1.9 25 km E of Hydesville, CA
  15. 2.9 31 km E 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 5.3 on 2023-01-01 — it released about 80,000 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.