QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

10km ESE of Millville, CA

· 16 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 27 kmTehama County 45 kmTrinity County 89 kmButte County 103 kmGlenn 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 1.8 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Shasta County, 27 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1744 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 40.5162, -122.0742. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 27 km (17 mi) S of here earthquakes near Shasta County
Tehama County, CA 45 km (28 mi) NNE of here earthquakes near Tehama County
Trinity County, CA 89 km (55 mi) E of here earthquakes near Trinity County
Butte County, CA 103 km (64 mi) NNW of here earthquakes near Butte County
Glenn County, CA 105 km (65 mi) NNE of here earthquakes near Glenn County
Plumas County, CA 121 km (75 mi) WNW of here earthquakes near Plumas 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. 1.6 8km NE of Shasta Lake, CA
  2. 2.5 14km ENE of Red Bluff, CA
  3. 1.6 9km NE of Shasta Lake, CA
  4. 1.5 18km ESE of Anderson, CA
  5. 2.6 12km W of Shingletown, CA
  6. 1.7 24km N of Shasta Lake, CA
  7. 1.8 6km SW of Shasta Lake, CA
  8. 1.9 17km WSW of Manton, CA
  9. 1.7 13km NNE of Shingletown, CA
  10. 1.6 8km NE of Shasta Lake, CA
  11. 1.9 13km ESE of Viola, CA
  12. 1.7 4km SW of Millville, CA
  13. 1.8 4km NNE of Viola, CA
  14. 1.8 24km S of Manton, CA
  15. 1.6 9km NE of Shasta Lake, 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.