QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

11 km WSW of Durham, CA

· 23 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Butte County 28 kmGlenn County 41 kmColusa County 56 kmTehama County 62 kmYuba County 63 kmSutter County 68 kmLake County 91 kmPlumas County 103 kmYolo County 105 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
no reports yet
Nearest
Butte County, 28 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 377 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 40 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 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 39.6202, -121.9258. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Butte County, CA 28 km (17 mi) W of here earthquakes near Butte County
Glenn County, CA 41 km (25 mi) E of here earthquakes near Glenn County
Colusa County, CA 56 km (35 mi) NNE of here earthquakes near Colusa County
Tehama County, CA 62 km (39 mi) SSE of here earthquakes near Tehama County
Yuba County, CA 63 km (39 mi) NW of here earthquakes near Yuba County
Sutter County, CA 68 km (42 mi) NNW of here earthquakes near Sutter County

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

Aftershocks so far

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

  1. 2.7 5 km W of Hamilton City, CA
  2. 2.5 15 km S of Hamilton City, CA
  3. 2.2 4 km WSW of Hamilton City, CA
  4. 2.0 17 km E of Willows, CA
  5. 1.9 19 km E of Willows, CA
  6. 2.4 9 km S of Hamilton City, CA
  7. 1.9 5 km WSW of Concow, CA
  8. 3.1 9 km ENE of Colusa, CA
  9. 3.2 15 km E of Willows, CA
  10. 2.1 16 km ESE of Willows, CA
  11. 2.3 13 km NNW of Chico, CA
  12. 2.8 12 km SSE of Willows, CA
  13. 2.2 3 km SE of Hamilton City, CA
  14. 2.5 15 km ENE of Willows, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.2 on 2022-07-23 — it released about 1,700 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.