QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6mw

3 km NE of Almanor, CA

· 6.4 km deep · released about 3.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 40 kmLassen County 70 kmButte County 74 kmSierra County 92 kmTehama County 92 kmShasta County 94 kmYuba County 109 kmNevada County 110 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 3.6 (mw)
Depth
6.4 km below the surface
Felt
85 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Plumas County, 40 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 627 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 85 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 50,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,600× the energy of this one
  4. This earthquake M 3.6 about 3.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.2× more

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 40.2420, -121.1595. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 40 km (25 mi) NW of here earthquakes near Plumas County
Lassen County, CA 70 km (43 mi) SW of here earthquakes near Lassen County
Butte County, CA 74 km (46 mi) NNE of here earthquakes near Butte County
Sierra County, CA 92 km (57 mi) NW of here earthquakes near Sierra County
Tehama County, CA 92 km (57 mi) E of here earthquakes near Tehama County
Shasta County, CA 94 km (59 mi) SE of here earthquakes near Shasta County

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

Aftershocks so far

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

  1. 1.5 23 km ENE of Viola, CA
  2. 1.6 25 km ENE of Viola, CA
  3. 1.6 3 km NNE of Prattville, CA
  4. 2.0 2 km NNE of Prattville, CA
  5. 1.7 3 km NE of Prattville, CA
  6. 1.9 0 km of Prattville, CA
  7. 2.8 2 km NNE of Prattville, CA
  8. 1.7 4 km ENE of Prattville, CA
  9. 2.1 2 km NNE of Prattville, CA
  10. 1.9 3 km ENE of Prattville, CA
  11. 1.7 7 km SSE of Mineral, CA
  12. 2.6 2 km NE of Prattville, CA
  13. 2.3 3 km ENE of Almanor, CA
  14. 2.4 3 km NE of Almanor, CA
  15. 2.3 2 km NE of Almanor, 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 5.5 on 2023-05-11 — it released about 730 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.