QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

9km N of Loma Rica, CA

· 1.9 km deep · released about 72 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yuba County 16 kmButte County 34 kmSutter County 46 kmNevada County 58 kmPlacer County 71 kmColusa County 74 kmSierra County 80 kmPlumas County 84 kmGlenn County 87 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
1.9 km below the surface
Felt
8 reports · strongest reported intensity IV
Nearest
Yuba County, 16 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2048 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 8 people have reported feeling it to USGS.

How big was it?

This earthquake released about 72 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 5.8 210,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 150,000× the energy of this one
  3. Around the size people start to feel M 3.0 13× the energy of this one
  4. This earthquake M 2.3 about 72 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 39.3945, -121.4293. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Yuba County, CA 16 km (10 mi) NNW of here earthquakes near Yuba County
Butte County, CA 34 km (21 mi) SSE of here earthquakes near Butte County
Sutter County, CA 46 km (29 mi) NNE of here earthquakes near Sutter County
Nevada County, CA 58 km (36 mi) W of here earthquakes near Nevada County
Placer County, CA 71 km (44 mi) WNW of here earthquakes near Placer County
Colusa County, CA 74 km (46 mi) ENE of here earthquakes near Colusa County

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

Aftershocks so far

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

  1. 2.0 6 km E of Challenge-Brownsville, CA
  2. 2.1 8 km WNW of La Porte, CA
  3. 2.1 7 km ESE of Challenge-Brownsville, CA
  4. 1.9 19 km E of Willows, CA
  5. 1.9 5 km WSW of Concow, CA
  6. 2.2 9 km SSW of South Yuba City, CA
  7. 3.1 9 km ENE of Colusa, CA
  8. 2.1 11 km WSW of Durham, CA
  9. 1.8 8 km NNE of Oroville East, CA
  10. 1.7 8 km NNE of Oroville East, CA
  11. 1.8 19 km ESE of Willows, CA
  12. 2.1 6 km W of Magalia, CA
  13. 2.1 12 km W of La Porte, CA
  14. 2.1 8km WSW of Durham, CA
  15. 2.1 10km N of Oroville, 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.