QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

23km ESE of McArthur, CA

· 19 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lassen County 53 kmModoc County 76 kmShasta County 80 kmPlumas County 114 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 1.9 (md)
Depth
19 km below the surface
Felt
no reports yet
Nearest
Lassen County, 53 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1881 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 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 790,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 560,000× the energy of this one
  3. Around the size people start to feel M 3.0 50× the energy of this one
  4. This earthquake M 1.9 about 19 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 40.9880, -121.1410. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lassen County, CA 53 km (33 mi) NW of here earthquakes near Lassen County
Modoc County, CA 76 km (47 mi) SSW of here earthquakes near Modoc County
Shasta County, CA 80 km (50 mi) ENE of here earthquakes near Shasta County
Plumas County, CA 114 km (71 mi) NNW of here earthquakes near Plumas County
Tehama County, CA 133 km (83 mi) NE of here earthquakes near Tehama County
Siskiyou County, CA 134 km (83 mi) ESE of here earthquakes near Siskiyou 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. 2.8 8 km W of Fall River Mills, CA
  2. 1.8 11 km WSW of Fall River Mills, CA
  3. 1.9 8 km NE of Burney, CA
  4. 1.9 8 km NE of Burney, CA
  5. 2.1 8 km NE of Burney, CA
  6. 2.0 11 km WSW of Fall River Mills, CA
  7. 2.1 12 km WSW of Fall River Mills, CA
  8. 1.9 12 km WSW of Fall River Mills, CA
  9. 1.9 11 km WSW of Fall River Mills, CA
  10. 1.9 12 km WSW of Fall River Mills, CA
  11. 2.0 12 km WSW of Fall River Mills, CA
  12. 2.4 12 km NE of Burney, CA
  13. 2.2 11 km WSW of Fall River Mills, CA
  14. 2.7 11 km WSW of Fall River Mills, CA
  15. 2.8 12 km NE of Burney, 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.