QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

16km SW of La Porte, CA

· 11 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yuba County 39 kmNevada County 42 kmButte County 43 kmSierra County 50 kmPlumas County 53 kmPlacer County 66 kmSutter County 78 kmEl Dorado County 100 kmColusa County 106 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 1.8 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Yuba County, 39 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2883 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 39.5708, -121.1105. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Yuba County, CA 39 km (24 mi) NNE of here earthquakes near Yuba County
Nevada County, CA 42 km (26 mi) NW of here earthquakes near Nevada County
Butte County, CA 43 km (27 mi) ESE of here earthquakes near Butte County
Sierra County, CA 50 km (31 mi) W of here earthquakes near Sierra County
Plumas County, CA 53 km (33 mi) SSW of here earthquakes near Plumas County
Placer County, CA 66 km (41 mi) NNW of here earthquakes near Placer County

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

Aftershocks so far

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

  1. 1.8 9km SSE of Challenge-Brownsville, CA
  2. 2.0 3km NNE of Spring Garden, CA
  3. 2.3 8km WSW of Penn Valley, CA
  4. 2.1 9km ENE of Loma Rica, CA
  5. 3.1 5km NE of East Quincy, CA
  6. 1.6 10km E of Loma Rica, CA
  7. 1.9 10km ENE of Loma Rica, CA
  8. 1.7 10km N of Thermalito, CA
  9. 2.3 5km NNE of Little Grass Valley, CA
  10. 2.1 6km S of Bucks Lake, CA
  11. 2.1 8km W of La Porte, CA
  12. 2.3 22km SW of Whitehawk, CA
  13. 1.9 10km NNW of Oroville, CA
  14. 2.5 4km SE of Concow, CA
  15. 1.9 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.