QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

4 km NE of Lake Davis, California

· 11 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 35 kmSierra County 36 kmNevada County 72 kmLassen County 92 kmStorey County 93 kmPlacer County 96 kmCarson City 102 kmButte County 103 kmYuba 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 2.1 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Plumas County, 35 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3009 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 38 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 39.8962, -120.4375. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 35 km (22 mi) ESE of here earthquakes near Plumas County
Sierra County, CA 36 km (23 mi) NNE of here earthquakes near Sierra County
Nevada County, CA 72 km (45 mi) NNE of here earthquakes near Nevada County
Lassen County, CA 92 km (57 mi) S of here earthquakes near Lassen County
Storey County, NV 93 km (58 mi) WNW of here earthquakes near Storey County
Placer County, CA 96 km (60 mi) NNE of here earthquakes near Placer 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. 2.3 8 km SSE of Sierraville, California
  2. 2.4 4 km W of Calpine, California
  3. 2.8 1 km ENE of Blairsden, California
  4. 1.9 7 km WNW of Plumas Eureka (historical), California
  5. 1.6 2 km WSW of Sattley, California
  6. 1.8 6 km S of Sattley, California
  7. 2.2 2 km ESE of Sattley, California
  8. 1.8 2 km ESE of Sattley, California
  9. 2.4 2 km WNW of Sierraville, California
  10. 1.9 4 km SSE of Sierra City, California
  11. 1.8 6 km NNW of Cold Springs, Nevada
  12. 1.5 9 km ESE of Sierra Brooks, California
  13. 1.6 3 km SSE of Gold Mountain, California
  14. 1.5 13 km SE of Sierraville, California
  15. 2.1 13 km SSE of Sierraville, 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 4.5 on 2016-08-04 — it released about 4,100 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.