QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0md

31km SW of Hayfork, CA

· 28 km deep · released about 26 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 42 kmHumboldt County 60 kmMendocino County 101 kmTehama County 103 kmGlenn County 119 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 2.0 (md)
Depth
28 km below the surface
Felt
no reports yet
Nearest
Trinity County, 42 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3202 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 26 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 580,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 410,000× the energy of this one
  3. Around the size people start to feel M 3.0 36× the energy of this one
  4. This earthquake M 2.0 about 26 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 40.3395, -123.4110. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 42 km (26 mi) SW of here earthquakes near Trinity County
Humboldt County, CA 60 km (37 mi) SE of here earthquakes near Humboldt County
Mendocino County, CA 101 km (63 mi) N of here earthquakes near Mendocino County
Tehama County, CA 103 km (64 mi) WNW of here earthquakes near Tehama County
Glenn County, CA 119 km (74 mi) NW of here earthquakes near Glenn County
Shasta County, CA 125 km (77 mi) WSW of here earthquakes near Shasta County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.1 42km NNE of Covelo, CA
  2. 1.8 13km ESE of Hydesville, CA
  3. 1.5 1km ENE of Redway, CA
  4. 1.9 25km SE of Hayfork, CA
  5. 2.5 40km SSE of Hayfork, CA
  6. 2.3 38km SSE of Hayfork, CA
  7. 2.1 34km ENE of Redway, CA
  8. 2.3 28km W of Hayfork, CA
  9. 2.4 28km W of Hayfork, CA
  10. 1.6 23km SSE of Rio Dell, CA
  11. 1.8 28km SE of Redway, CA
  12. 2.0 37km NNE of Covelo, CA
  13. 1.6 29km NNE of Redway, CA
  14. 1.9 20km SE of Rio Dell, CA
  15. 1.7 30km NNE 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 6,200 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.