QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

1 km ENE of Blairsden, California

· 11 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sierra County 24 kmPlumas County 30 kmNevada County 56 kmPlacer County 81 kmYuba County 86 kmButte County 87 kmStorey County 100 kmCarson City 101 kmLassen County 104 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
11 km below the surface
Felt
26 reports · strongest reported intensity III
Nearest
Sierra County, 24 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3009 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 26 people have reported feeling it to USGS.

How big was it?

This earthquake released about 480 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 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 39.7835, -120.6017. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sierra County, CA 24 km (15 mi) NNW of here earthquakes near Sierra County
Plumas County, CA 30 km (19 mi) SE of here earthquakes near Plumas County
Nevada County, CA 56 km (35 mi) NNE of here earthquakes near Nevada County
Placer County, CA 81 km (50 mi) N of here earthquakes near Placer County
Yuba County, CA 86 km (53 mi) NE of here earthquakes near Yuba County
Butte County, CA 87 km (54 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

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

  1. 1.8 10km NNE of Lake Davis, CA
  2. 1.6 4km WSW of Johnsville, CA
  3. 2.0 3km WSW of Cromberg, CA
  4. 1.5 18km SSW of Whitehawk, CA
  5. 1.6 2km SW of Cromberg, CA
  6. 2.1 5km NNE of Lake Davis, CA
  7. 1.9 5km NNE of Lake Davis, CA
  8. 1.6 9km N of Spring Garden, CA
  9. 2.0 9km NNW of Loyalton, CA
  10. 2.3 3km ENE of Greenhorn, CA
  11. 1.7 18km NNE of Chilcoot-Vinton, CA
  12. 1.9 2km ESE of Twain, CA
  13. 1.8 10km NNE of Greenhorn, CA
  14. 2.5 17km NNE of Chilcoot-Vinton, CA
  15. 2.1 5km E of Indian Falls, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.