QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

0 km NNE of Valley Ranch, CA

· 5.0 km deep · released about 430 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sierra County 19 kmPlumas County 36 kmNevada County 53 kmPlacer County 77 kmYuba County 85 kmButte County 89 kmStorey County 95 kmCarson City 96 kmEl Dorado County 106 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 2.8 (md)
Depth
5.0 km below the surface
Felt
6 reports · strongest reported intensity III
Nearest
Sierra County, 19 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1023 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 6 people have reported feeling it to USGS.

How big was it?

This earthquake released about 430 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 35,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 25,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.2× the energy of this one
  4. This earthquake M 2.8 about 430 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 39.7425, -120.5643. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sierra County, CA 19 km (12 mi) N of here earthquakes near Sierra County
Plumas County, CA 36 km (22 mi) SE of here earthquakes near Plumas County
Nevada County, CA 53 km (33 mi) NNE of here earthquakes near Nevada County
Placer County, CA 77 km (48 mi) N of here earthquakes near Placer County
Yuba County, CA 85 km (53 mi) NE of here earthquakes near Yuba County
Butte County, CA 89 km (55 mi) E of here earthquakes near Butte County

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

Aftershocks so far

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

  1. 1.5 6 km SE of Beckwourth, California
  2. 2.3 18 km NNW of Truckee, CA
  3. 2.9 0 km NNE of Whitehawk, CA
  4. 2.3 4 km S of Cromberg, CA
  5. 2.4 17 km N of Truckee, CA
  6. 1.5 9 km SSE of Sierraville, California
  7. 1.7 4 km SW of Sierra Brooks, California
  8. 1.7 7 km ENE of East Quincy, California
  9. 2.2 4 km NNW of Spring Garden, CA
  10. 2.2 5 km NNE of East Quincy, CA
  11. 1.5 13 km NE of Lake Davis, California
  12. 3.4 4 km ENE of East Quincy, CA
  13. 2.0 4 km SW of Whitehawk, California
  14. 2.2 9 km SE of Meadow Valley, CA
  15. 1.6 Northern California

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 4.7 on 2021-05-07 — it released about 660 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.