QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

10km SE of McArthur, CA

· 18 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lassen County 66 kmShasta County 68 kmModoc County 82 kmPlumas County 119 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 1.7 (md)
Depth
18 km below the surface
Felt
no reports yet
Nearest
Lassen County, 66 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2665 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 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× the energy of this one
  4. This earthquake M 1.7 about 10 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 41.0017, -121.3037. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lassen County, CA 66 km (41 mi) WNW of here earthquakes near Lassen County
Shasta County, CA 68 km (42 mi) ENE of here earthquakes near Shasta County
Modoc County, CA 82 km (51 mi) SW of here earthquakes near Modoc County
Plumas County, CA 119 km (74 mi) NNW of here earthquakes near Plumas County
Siskiyou County, CA 122 km (76 mi) ESE of here earthquakes near Siskiyou County
Tehama County, CA 125 km (78 mi) NE of here earthquakes near Tehama County

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

Aftershocks so far

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

  1. 1.9 19km NW of McArthur, CA
  2. 2.0 2km SW of McArthur, CA
  3. 2.1 9km NNE of Burney, CA
  4. 1.9 2km NNE of Fall River Mills, CA
  5. 1.6 22km NE of Viola, CA
  6. 1.6 17km N of Burney, CA
  7. 1.5 8km WNW of Burney, CA
  8. 2.0 45km SE of Fall River Mills, CA
  9. 2.4 44km SE of Fall River Mills, CA
  10. 2.0 22km E of McArthur, CA
  11. 1.6 23km SE of Burney, CA
  12. 1.8 15km N of Burney, CA
  13. 1.6 11km WNW of Burney, CA
  14. 1.6 10km WNW of Burney, CA
  15. 1.6 10km SSE 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.