QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

23km NNW of Hayfork, CA

· 27 km deep · released about 24 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 20 kmHumboldt County 51 kmShasta County 108 kmTehama County 114 kmSiskiyou County 116 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 1.9 (md)
Depth
27 km below the surface
Felt
no reports yet
Nearest
Trinity County, 20 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2852 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 24 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 640,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 450,000× the energy of this one
  3. Around the size people start to feel M 3.0 40× the energy of this one
  4. This earthquake M 1.9 about 24 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 40.7282, -123.3248. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 20 km (12 mi) WNW of here earthquakes near Trinity County
Humboldt County, CA 51 km (32 mi) E of here earthquakes near Humboldt County
Shasta County, CA 108 km (67 mi) W of here earthquakes near Shasta County
Tehama County, CA 114 km (71 mi) NW of here earthquakes near Tehama County
Siskiyou County, CA 116 km (72 mi) SW of here earthquakes near Siskiyou County
Del Norte County, CA 126 km (78 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

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

  1. 2.1 7km SE of Willow Creek, CA
  2. 2.3 26km WSW of Hayfork, CA
  3. 1.8 19km E of Willow Creek, CA
  4. 1.9 6km N of Hayfork, CA
  5. 2.2 18km E of Willow Creek, CA
  6. 2.8 22km NE of Willow Creek, CA
  7. 2.6 21km NE of Willow Creek, CA
  8. 2.3 36km SSW of Hayfork, CA
  9. 1.6 31km WSW of Hayfork, CA
  10. 1.6 28km W of Hayfork, CA
  11. 1.9 7km N of Hayfork, CA
  12. 2.9 18km ESE of Weitchpec, CA
  13. 2.4 16km SW of Willow Creek, CA
  14. 2.2 37km W of Hayfork, CA
  15. 2.0 38km W 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 6,900 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.