QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

28km ESE of Fall River Mills, CA

· 6.7 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lassen County 49 kmShasta County 75 kmModoc County 88 kmPlumas County 102 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
6.7 km below the surface
Felt
no reports yet
Nearest
Lassen County, 49 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2749 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 12 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 870,000× the energy of this one
  3. Around the size people start to feel M 3.0 78× the energy of this one
  4. This earthquake M 1.7 about 12 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 40.8712, -121.1627. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lassen County, CA 49 km (30 mi) WNW of here earthquakes near Lassen County
Shasta County, CA 75 km (47 mi) E of here earthquakes near Shasta County
Modoc County, CA 88 km (55 mi) SSW of here earthquakes near Modoc County
Plumas County, CA 102 km (63 mi) NNW of here earthquakes near Plumas County
Tehama County, CA 123 km (76 mi) NE of here earthquakes near Tehama County
Siskiyou County, CA 140 km (87 mi) SE of here earthquakes near Siskiyou County

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

Aftershocks so far

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

  1. 1.9 23km ESE of McArthur, CA
  2. 1.7 12km W of Fall River Mills, CA
  3. 2.5 48km NNW of Susanville, CA
  4. 1.9 19km NW of McArthur, CA
  5. 2.0 2km SW of McArthur, CA
  6. 1.6 25km NNE of Hamilton Branch, CA
  7. 1.8 33km NNW of Susanville, CA
  8. 2.1 9km NNE of Burney, CA
  9. 2.5 13km N of Viola, CA
  10. 1.9 2km NNE of Fall River Mills, CA
  11. 1.6 22km NE of Viola, CA
  12. 1.6 30km NNE of Hamilton Branch, CA
  13. 1.8 20km WNW of Susanville, CA
  14. 1.6 17km N of Burney, CA
  15. 2.0 45km SE 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.