QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0md

42km S of Hayfork, CA

· 36 km deep · released about 33 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 53 kmTehama County 79 kmMendocino County 86 kmHumboldt County 87 kmGlenn County 91 kmShasta 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 2.0 (md)
Depth
36 km below the surface
Felt
no reports yet
Nearest
Trinity County, 53 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3204 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 33 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 5.8 450,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 320,000× the energy of this one
  3. Around the size people start to feel M 3.0 29× the energy of this one
  4. This earthquake M 2.0 about 33 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 40.1760, -123.1642. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 53 km (33 mi) S of here earthquakes near Trinity County
Tehama County, CA 79 km (49 mi) W of here earthquakes near Tehama County
Mendocino County, CA 86 km (53 mi) NNE of here earthquakes near Mendocino County
Humboldt County, CA 87 km (54 mi) SE of here earthquakes near Humboldt County
Glenn County, CA 91 km (57 mi) NW of here earthquakes near Glenn County
Shasta County, CA 115 km (71 mi) SW of here earthquakes near Shasta County

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

Aftershocks so far

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

  1. 2.0 37km NNE of Covelo, CA
  2. 1.6 29km NNE of Redway, CA
  3. 2.2 40km NE of Covelo, CA
  4. 1.8 28km NNW of Alder Springs, CA
  5. 1.7 30km NNE of Redway, CA
  6. 1.6 20km N of Covelo, CA
  7. 1.9 35km WNW of Rancho Tehama Reserve, CA
  8. 1.7 42km NW of Rancho Tehama Reserve, CA
  9. 1.7 40km NE of Covelo, CA
  10. 2.4 41km NE of Covelo, CA
  11. 2.0 8km NE of Covelo, CA
  12. 2.0 37km NNE of Redway, CA
  13. 2.0 16km N of Laytonville, CA
  14. 2.5 38km NNE of Redway, CA
  15. 1.8 39km NE of Covelo, 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 4,900 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.