QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

4km NNW of Millville, CA

· 14 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 23 kmTehama County 52 kmTrinity County 77 kmGlenn County 112 kmSiskiyou County 114 kmButte County 115 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
14 km below the surface
Felt
no reports yet
Nearest
Shasta County, 23 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2988 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 40.5945, -122.2008. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 23 km (14 mi) SW of here earthquakes near Shasta County
Tehama County, CA 52 km (32 mi) N of here earthquakes near Tehama County
Trinity County, CA 77 km (48 mi) E of here earthquakes near Trinity County
Glenn County, CA 112 km (69 mi) N of here earthquakes near Glenn County
Siskiyou County, CA 114 km (71 mi) SSE of here earthquakes near Siskiyou County
Butte County, CA 115 km (72 mi) NNW of here earthquakes near Butte County

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

Aftershocks so far

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

  1. 2.8 7km NW of Montgomery Creek, CA
  2. 1.8 8km NNE of Viola, CA
  3. 1.6 16km W of Manton, CA
  4. 1.9 6km ENE of Shasta, CA
  5. 2.0 14km SE of Millville, CA
  6. 1.6 20km NE of Red Bluff, CA
  7. 1.8 21km NE of Red Bluff, CA
  8. 2.3 19km NE of Red Bluff, CA
  9. 1.5 17km NE of Red Bluff, CA
  10. 1.6 9km NNE of Shasta Lake, CA
  11. 1.8 5km WNW of Shasta Lake, CA
  12. 1.8 18km WNW of Round Mountain, CA
  13. 1.7 10km S of Shasta, CA
  14. 1.6 17km ESE of Anderson, CA
  15. 1.7 8km N of Shasta, 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.