QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

30km SW of Hayfork, CA

· 29 km deep · released about 23 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 41 kmHumboldt County 53 kmMendocino County 106 kmTehama County 108 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
29 km below the surface
Felt
no reports yet
Nearest
Trinity County, 41 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2847 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 23 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 5.8 660,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 470,000× the energy of this one
  3. Around the size people start to feel M 3.0 42× the energy of this one
  4. This earthquake M 1.9 about 23 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 40.3885, -123.4632. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 41 km (26 mi) SW of here earthquakes near Trinity County
Humboldt County, CA 53 km (33 mi) SE of here earthquakes near Humboldt County
Mendocino County, CA 106 km (66 mi) N of here earthquakes near Mendocino County
Tehama County, CA 108 km (67 mi) WNW of here earthquakes near Tehama County
Glenn County, CA 126 km (78 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

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

  1. 2.0 8km E of Hydesville, CA
  2. 3.0 27km WNW of Hayfork, CA
  3. 2.4 17km SE of Willow Creek, CA
  4. 2.1 16km ENE of Hydesville, CA
  5. 2.0 11km WNW of Hayfork, CA
  6. 2.0 11km WNW of Hayfork, CA
  7. 1.6 30km S of Willow Creek, CA
  8. 2.0 35km W of Hayfork, CA
  9. 2.6 17km SSE of Hayfork, CA
  10. 2.0 5km NW of Redway, CA
  11. 1.7 11km SE of Redway, CA
  12. 1.9 5km E of Redway, CA
  13. 2.0 42km N of Covelo, CA
  14. 2.4 24km NNW of Hayfork, CA
  15. 1.5 4km NNW 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 4.5 on 2016-08-28 — it released about 7,200 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.