QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

3km NNW of Johnsville, CA

· -1.9 km deep · released about 20 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 23 kmSierra County 30 kmNevada County 57 kmButte County 77 kmYuba County 80 kmPlacer County 83 kmLassen County 102 kmStorey County 110 kmCarson City 110 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 1.9 (md)
Depth
-1.9 km below the surface
Felt
no reports yet
Nearest
Plumas County, 23 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1602 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 20 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 760,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 540,000× the energy of this one
  3. Around the size people start to feel M 3.0 48× the energy of this one
  4. This earthquake M 1.9 about 20 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 39.8050, -120.7158. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 23 km (14 mi) SSE of here earthquakes near Plumas County
Sierra County, CA 30 km (19 mi) NNW of here earthquakes near Sierra County
Nevada County, CA 57 km (35 mi) N of here earthquakes near Nevada County
Butte County, CA 77 km (48 mi) ENE of here earthquakes near Butte County
Yuba County, CA 80 km (50 mi) NE of here earthquakes near Yuba County
Placer County, CA 83 km (51 mi) N of here earthquakes near Placer County

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

Aftershocks so far

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

  1. 1.6 7 km ENE of Cromberg, California
  2. 2.5 1km NW of Lake Davis, CA
  3. 2.4 1km NW of Lake Davis, CA
  4. 2.1 1km WNW of Lake Davis, CA
  5. 2.0 1km NW of Lake Davis, CA
  6. 2.8 0km N of Lake Davis, CA
  7. 2.2 1km WNW of Lake Davis, CA
  8. 2.8 0km ESE of Lake Davis, CA
  9. 3.0 0km NNW of Lake Davis, CA
  10. 2.4 0km NNW of Lake Davis, CA
  11. 2.5 0km NW of Lake Davis, CA
  12. 2.1 0km NE of Lake Davis, CA
  13. 2.2 1km WNW of Lake Davis, CA
  14. 2.2 0km WNW of Lake Davis, CA
  15. 2.0 1km NW of Lake Davis, 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.