QuakeIndex

Earthquake · automatic estimate, may change

M 2.1md

21 km NNW of Hayfork, CA

· 22 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 18 kmHumboldt County 53 kmShasta County 106 kmTehama County 112 kmSiskiyou County 115 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
22 km below the surface
Felt
no reports yet
Nearest
Trinity County, 18 km ESE
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 354 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 51 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 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 51 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 40.7255, -123.3008. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 18 km (11 mi) WNW of here earthquakes near Trinity County
Humboldt County, CA 53 km (33 mi) E of here earthquakes near Humboldt County
Shasta County, CA 106 km (66 mi) W of here earthquakes near Shasta County
Tehama County, CA 112 km (70 mi) NW of here earthquakes near Tehama County
Siskiyou County, CA 115 km (72 mi) SW of here earthquakes near Siskiyou County
Del Norte County, CA 127 km (79 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. 1.9 36 km E of Hydesville, CA
  2. 2.0 12 km NW of Hayfork, CA
  3. 3.7 36 km E of Hydesville, CA
  4. 1.9 16 km SSE of Willow Creek, CA
  5. 1.9 12 km ESE of Willow Creek, CA
  6. 2.2 10 km NNW of Willow Creek, CA
  7. 1.9 16 km E of Willow Creek, CA
  8. 1.7 29 km WSW of Hayfork, CA
  9. 2.5 28 km NW of Weaverville, CA
  10. 2.0 30 km E of Rio Dell, CA
  11. 2.1 17 km ENE of Willow Creek, CA
  12. 2.1 34 km NE of Redway, CA
  13. 2.0 13 km E of Willow Creek, CA
  14. 2.0 26 km S of Hayfork, CA
  15. 2.1 27 km ENE 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 4.5 on 2016-08-28 — it released about 3,200 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.