QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

6km E of Durham, CA

· 22 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Butte County 11 kmYuba County 54 kmGlenn County 58 kmColusa County 68 kmSutter County 68 kmTehama County 68 kmPlumas County 86 kmNevada County 91 kmSierra County 104 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
22 km below the surface
Felt
no reports yet
Nearest
Butte County, 11 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2711 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 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× 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 39.6485, -121.7307. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Butte County, CA 11 km (7 mi) W of here earthquakes near Butte County
Yuba County, CA 54 km (33 mi) NW of here earthquakes near Yuba County
Glenn County, CA 58 km (36 mi) E of here earthquakes near Glenn County
Colusa County, CA 68 km (42 mi) NE of here earthquakes near Colusa County
Sutter County, CA 68 km (42 mi) N of here earthquakes near Sutter County
Tehama County, CA 68 km (42 mi) SE of here earthquakes near Tehama County

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

Aftershocks so far

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

  1. 1.9 4km NE of Hamilton City, CA
  2. 2.1 9km ENE of Loma Rica, CA
  3. 2.1 15km ESE of Willows, CA
  4. 1.8 4km NE of Hamilton City, CA
  5. 2.1 4km NE of Hamilton City, CA
  6. 2.2 13km WSW of Durham, CA
  7. 1.7 3km NNE of Hamilton City, CA
  8. 1.7 4km NNE of Hamilton City, CA
  9. 2.6 13km WSW of Durham, CA
  10. 1.9 10km ENE of Loma Rica, CA
  11. 2.8 4km N of Hamilton City, CA
  12. 1.6 17km WSW of Durham, CA
  13. 1.7 10km N of Thermalito, CA
  14. 1.9 5km W of Hamilton City, CA
  15. 1.8 1km NNE of Chico, 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.