QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

19km NW of McArthur, CA

· 4.0 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 59 kmModoc County 86 kmSiskiyou County 93 kmLassen 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 1.9 (md)
Depth
4.0 km below the surface
Felt
no reports yet
Nearest
Shasta County, 59 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1920 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 5.8 810,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 580,000× the energy of this one
  3. Around the size people start to feel M 3.0 51× 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 41.1577, -121.5742. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 59 km (37 mi) NE of here earthquakes near Shasta County
Modoc County, CA 86 km (54 mi) SW of here earthquakes near Modoc County
Siskiyou County, CA 93 km (58 mi) ESE of here earthquakes near Siskiyou County
Lassen County, CA 94 km (58 mi) WNW of here earthquakes near Lassen County
Tehama County, CA 127 km (79 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

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

  1. 1.8 12 km NE of Burney, CA
  2. 1.9 11 km WSW of Fall River Mills, CA
  3. 2.1 12 km NE of Burney, CA
  4. 4.3 12 km NE of Burney, CA
  5. 5.0 12 km NE of Burney, CA
  6. 1.6 23 km SE of Burney, CA
  7. 1.6 9 km NNW of Montgomery Creek, CA
  8. 1.6 8 km N of Montgomery Creek, CA
  9. 2.3 17 km NW of Fall River Mills, CA
  10. 1.7 11 km WNW of Big Bend, CA
  11. 2.3 17 km NW of Fall River Mills, CA
  12. 2.3 16 km NW of Fall River Mills, CA
  13. 2.3 18 km NW of Fall River Mills, CA
  14. 1.7 10km W of Big Bend, CA
  15. 1.8 5km NNE of Montgomery Creek, 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.