QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

17km ESE of Hayfork, CA

· 39 km deep · released about 91 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 20 kmTehama County 77 kmHumboldt County 81 kmShasta County 87 kmGlenn County 111 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 2.3 (md)
Depth
39 km below the surface
Felt
3 reports · strongest reported intensity III
Nearest
Trinity County, 20 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2896 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 91 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 170,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 120,000× the energy of this one
  3. Around the size people start to feel M 3.0 10× the energy of this one
  4. This earthquake M 2.3 about 91 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 40.4843, -123.0067. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 20 km (13 mi) SSE of here earthquakes near Trinity County
Tehama County, CA 77 km (48 mi) WNW of here earthquakes near Tehama County
Humboldt County, CA 81 km (51 mi) ESE of here earthquakes near Humboldt County
Shasta County, CA 87 km (54 mi) WSW of here earthquakes near Shasta County
Glenn County, CA 111 km (69 mi) NNW of here earthquakes near Glenn County
Mendocino County, CA 123 km (76 mi) NNE of here earthquakes near Mendocino 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. 1.9 41km NE of Covelo, CA
  2. 2.0 23km NNW of Hayfork, CA
  3. 2.3 27km SE of Willow Creek, CA
  4. 2.9 32km SSW of Hayfork, CA
  5. 2.3 26km WSW of Hayfork, CA
  6. 1.9 6km N of Hayfork, CA
  7. 2.3 36km SSW of Hayfork, CA
  8. 1.6 31km WSW of Hayfork, CA
  9. 1.6 28km W of Hayfork, CA
  10. 1.9 7km N of Hayfork, CA
  11. 1.6 1km N of Shasta, CA
  12. 1.8 41km NE of Covelo, CA
  13. 1.7 41km NE of Covelo, CA
  14. 2.6 41km S of Hayfork, CA
  15. 2.7 37km SSE 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 1,800 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.