QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0md

19 km S of Johnsville, CA

· 11 km deep · released about 28 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sierra County 18 kmNevada County 35 kmPlumas County 43 kmPlacer County 61 kmYuba County 66 kmButte County 76 kmEl Dorado County 93 kmCarson City 98 kmStorey County 105 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 2.0 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Sierra County, 18 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 174 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 28 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 540,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 380,000× the energy of this one
  3. Around the size people start to feel M 3.0 34× the energy of this one
  4. This earthquake M 2.0 about 28 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 39.6127, -120.7222. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sierra County, CA 18 km (11 mi) WNW of here earthquakes near Sierra County
Nevada County, CA 35 km (22 mi) N of here earthquakes near Nevada County
Plumas County, CA 43 km (27 mi) SSE of here earthquakes near Plumas County
Placer County, CA 61 km (38 mi) N of here earthquakes near Placer County
Yuba County, CA 66 km (41 mi) NE of here earthquakes near Yuba County
Butte County, CA 76 km (47 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

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

  1. 2.3 2 km ENE of Keddie, CA
  2. 2.2 9 km S of Johnsville, CA
  3. 2.1 7 km NE of Lake Davis, CA
  4. 2.0 6 km E of Challenge-Brownsville, CA
  5. 2.1 8 km WNW of La Porte, CA
  6. 2.6 8 km NE of Lake Davis, CA
  7. 2.1 7 km ESE of Challenge-Brownsville, CA
  8. 2.3 8 km NE of Lake Davis, CA
  9. 2.2 8 km NE of Lake Davis, CA
  10. 2.0 5 km SSW of Cromberg, CA
  11. 3.0 4 km WSW of Johnsville, CA
  12. 2.4 5 km NW of Johnsville, CA
  13. 2.1 8 km NE of Lake Davis, CA
  14. 2.2 8 km NE of Lake Davis, CA
  15. 2.1 16 km SE of Whitehawk, 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 4.7 on 2021-05-07 — it released about 10,000 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.