QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

31 km W of Hayfork, CA

· 28 km deep · released about 220 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 41 kmHumboldt County 43 kmMendocino County 115 kmTehama County 117 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 2.6 (md)
Depth
28 km below the surface
Felt
no reports yet
Nearest
Trinity County, 41 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 507 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 220 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 70,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 50,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.4× the energy of this one
  4. This earthquake M 2.6 about 220 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 40.4635, -123.5345. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 41 km (25 mi) WSW of here earthquakes near Trinity County
Humboldt County, CA 43 km (27 mi) SE of here earthquakes near Humboldt County
Mendocino County, CA 115 km (71 mi) N of here earthquakes near Mendocino County
Tehama County, CA 117 km (72 mi) WNW of here earthquakes near Tehama County
Glenn County, CA 136 km (84 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

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

  1. 2.0 23 km E of Hydesville, CA
  2. 1.5 5 km NW of Redway, CA
  3. 2.2 18 km SE of Redway, CA
  4. 3.1 23 km NNW of Hayfork, CA
  5. 1.8 10 km SW of Willow Creek, CA
  6. 2.0 13 km ESE of Redway, CA
  7. 1.6 12 km ESE of Redway, CA
  8. 2.1 13 km ESE of Redway, CA
  9. 2.1 22 km NNW of Hayfork, CA
  10. 2.0 21 km NNW of Hayfork, CA
  11. 2.4 22 km NNW of Hayfork, CA
  12. 2.1 21 km NNW of Hayfork, CA
  13. 2.5 22 km NNW of Hayfork, CA
  14. 1.5 16 km SSE of Rio Dell, CA
  15. 1.6 4 km ESE of Redway, 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 15,000 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.