QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

4 km ENE of East Quincy, CA

· -0.1 km deep · released about 1.6 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 5 kmSierra County 50 kmButte County 72 kmNevada County 73 kmYuba County 87 kmLassen County 87 kmPlacer County 99 kmTehama 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 3.4 (ml)
Depth
-0.1 km below the surface
Felt
81 reports · strongest reported intensity V
Nearest
Plumas County, 5 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 273 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 81 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 110,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,300× the energy of this one
  4. This earthquake M 3.4 about 1.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.3× 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 39.9480, -120.8488. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 5 km (3 mi) SSW of here earthquakes near Plumas County
Sierra County, CA 50 km (31 mi) NW of here earthquakes near Sierra County
Butte County, CA 72 km (45 mi) ENE of here earthquakes near Butte County
Nevada County, CA 73 km (45 mi) N of here earthquakes near Nevada County
Yuba County, CA 87 km (54 mi) NNE of here earthquakes near Yuba County
Lassen County, CA 87 km (54 mi) SSW of here earthquakes near Lassen County

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

Aftershocks so far

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

  1. 2.1 3 km NE of Almanor, CA
  2. 2.5 1 km ENE of Prattville, CA
  3. 2.9 0 km NNE of Whitehawk, CA
  4. 2.6 4 km S of Caribou, CA
  5. 2.4 1 km N of Almanor, CA
  6. 2.1 4 km WNW of Canyondam, CA
  7. 2.6 4 km WNW of Canyondam, CA
  8. 2.1 3 km NNE of Prattville, CA
  9. 2.3 3 km E of Prattville, CA
  10. 2.1 1 km W of Canyondam, CA
  11. 1.9 2 km NNE of Prattville, CA
  12. 1.7 3 km NW of Canyondam, CA
  13. 2.3 4 km S of Cromberg, CA
  14. 1.9 2 km NNW of Almanor, CA
  15. 2.0 1 km NNW 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 1,600 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.