QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

11 km WSW of Biggs, California

· 23 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sutter County 38 kmButte County 38 kmColusa County 41 kmYuba County 43 kmGlenn County 56 kmYolo County 77 kmLake County 84 kmNevada County 91 kmTehama County 91 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 2.1 (md)
Depth
23 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Sutter County, 38 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3225 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 38 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 39.3662, -121.8273. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sutter County, CA 38 km (24 mi) NNW of here earthquakes near Sutter County
Butte County, CA 38 km (24 mi) SSW of here earthquakes near Butte County
Colusa County, CA 41 km (26 mi) ENE of here earthquakes near Colusa County
Yuba County, CA 43 km (27 mi) WNW of here earthquakes near Yuba County
Glenn County, CA 56 km (35 mi) ESE of here earthquakes near Glenn County
Yolo County, CA 77 km (48 mi) N of here earthquakes near Yolo County

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

Aftershocks so far

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

  1. 2.4 7km SSW of Williams, CA
  2. 1.9 6km N of Chico, CA
  3. 1.9 4km ENE of Palermo, CA
  4. 2.5 8km W of Durham, CA
  5. 1.6 15km SW of Durham, CA
  6. 2.2 11km N of Oroville, CA
  7. 1.6 18km ESE of Willows, CA
  8. 1.7 16km E of Willows, CA
  9. 1.7 12km W of Loma Rica, CA
  10. 1.6 7km SW of South Yuba City, CA
  11. 2.2 15km ENE of Willows, CA
  12. 1.9 10km N of Thermalito, CA
  13. 1.9 8km WNW of Durham, CA
  14. 1.9 6km W of Durham, CA
  15. 1.7 14km S of Hamilton City, 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.