QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

8km WSW of Penn Valley, CA

· 17 km deep · released about 82 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yuba County 13 kmSutter County 39 kmNevada County 46 kmPlacer County 49 kmButte County 62 kmYolo County 76 kmEl Dorado County 77 kmSierra County 79 kmSacramento County 80 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 2.3 (md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Yuba County, 13 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 82 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 82 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 39.1657, -121.2785. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Yuba County, CA 13 km (8 mi) SSE of here earthquakes near Yuba County
Sutter County, CA 39 km (25 mi) ENE of here earthquakes near Sutter County
Nevada County, CA 46 km (29 mi) WSW of here earthquakes near Nevada County
Placer County, CA 49 km (31 mi) WNW of here earthquakes near Placer County
Butte County, CA 62 km (39 mi) SSE of here earthquakes near Butte County
Yolo County, CA 76 km (47 mi) NE of here earthquakes near Yolo County

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

Aftershocks so far

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

  1. 2.0 6 km E of Challenge-Brownsville, CA
  2. 2.1 7 km ESE of Challenge-Brownsville, CA
  3. 1.8 1 km WSW of Granite Bay, CA
  4. 2.1 2 km WSW of Granite Bay, CA
  5. 2.6 2 km NW of Granite Bay, CA
  6. 2.2 9 km SSW of South Yuba City, CA
  7. 1.8 8 km NNE of Oroville East, CA
  8. 1.7 8 km NNE of Oroville East, CA
  9. 2.5 12 km WSW of Lincoln, CA
  10. 2.3 13 km NNE of Rio Linda, CA
  11. 2.8 11 km WSW of Lincoln, CA
  12. 2.2 13 km WSW of Lincoln, CA
  13. 2.1 12 km NW of Roseville, CA
  14. 1.8 11 km SW of Lincoln, CA
  15. 2.2 12 km WSW of Lincoln, 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.