QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

18 km NW of Fall River Mills, CA

· 6.1 km deep · released about 77 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 53 kmModoc County 92 kmLassen County 93 kmSiskiyou County 94 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 2.3 (md)
Depth
6.1 km below the surface
Felt
no reports yet
Nearest
Shasta County, 53 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1151 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 77 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 77 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 41.1017, -121.6057. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 53 km (33 mi) NE of here earthquakes near Shasta County
Modoc County, CA 92 km (57 mi) SW of here earthquakes near Modoc County
Lassen County, CA 93 km (58 mi) WNW of here earthquakes near Lassen County
Siskiyou County, CA 94 km (59 mi) SE of here earthquakes near Siskiyou County
Tehama County, CA 121 km (75 mi) NNE of here earthquakes near Tehama County

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

Aftershocks so far

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

  1. 2.2 6 km SSE of McCloud, CA
  2. 1.7 17 km N of Viola, CA
  3. 1.7 4 km W of Round Mountain, CA
  4. 1.9 11 km NE of Burney, CA
  5. 2.1 8 km SE of McArthur, CA
  6. 2.0 11 km WSW of Fall River Mills, CA
  7. 2.7 11 km WSW of Fall River Mills, CA
  8. 2.2 11 km WSW of Fall River Mills, CA
  9. 1.8 10 km WSW of Fall River Mills, CA
  10. 2.2 21 km SW of Ambrose, CA
  11. 2.2 4 km ESE of Round Mountain, CA
  12. 2.0 21 km SW of Ambrose, CA
  13. 1.9 12 km WSW of Fall River Mills, CA
  14. 1.8 7 km NE of Burney, CA
  15. 2.8 8 km W of Fall River Mills, 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.