QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

11km N of McArthur, CA

· -1.2 km deep · released about 460 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 70 kmModoc County 74 kmLassen County 80 kmSiskiyou County 107 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 2.8 (md)
Depth
-1.2 km below the surface
Felt
8 reports · strongest reported intensity IV
Nearest
Shasta County, 70 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1560 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 8 people have reported feeling it to USGS.

How big was it?

This earthquake released about 460 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 33,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 23,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.1× the energy of this one
  4. This earthquake M 2.8 about 460 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 41.1492, -121.3868. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 70 km (44 mi) NE of here earthquakes near Shasta County
Modoc County, CA 74 km (46 mi) SW of here earthquakes near Modoc County
Lassen County, CA 80 km (50 mi) NW of here earthquakes near Lassen County
Siskiyou County, CA 107 km (67 mi) ESE of here earthquakes near Siskiyou County
Tehama County, CA 134 km (83 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

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

  1. 1.9 12 km WSW of Fall River Mills, CA
  2. 1.8 7 km NE of Burney, CA
  3. 2.8 8 km W of Fall River Mills, CA
  4. 1.8 11 km WSW of Fall River Mills, CA
  5. 1.9 8 km NE of Burney, CA
  6. 1.9 8 km NE of Burney, CA
  7. 2.1 8 km NE of Burney, CA
  8. 2.0 11 km WSW of Fall River Mills, CA
  9. 2.1 12 km WSW of Fall River Mills, CA
  10. 1.9 12 km WSW of Fall River Mills, CA
  11. 1.9 11 km WSW of Fall River Mills, CA
  12. 1.9 12 km WSW of Fall River Mills, CA
  13. 2.0 12 km WSW of Fall River Mills, CA
  14. 2.4 12 km NE of Burney, CA
  15. 2.2 11 km WSW 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.