QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

26 km SE of Fall River Mills, CA

· 16 km deep · released about 18 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lassen County 50 kmShasta County 74 kmModoc County 89 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 1.9 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Lassen County, 50 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 959 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 18 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 5.8 840,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 600,000× the energy of this one
  3. Around the size people start to feel M 3.0 53× the energy of this one
  4. This earthquake M 1.9 about 18 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 40.8722, -121.1792. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lassen County, CA 50 km (31 mi) WNW of here earthquakes near Lassen County
Shasta County, CA 74 km (46 mi) E of here earthquakes near Shasta County
Modoc County, CA 89 km (55 mi) SSW of here earthquakes near Modoc County
Plumas County, CA 102 km (64 mi) NNW of here earthquakes near Plumas County
Tehama County, CA 122 km (76 mi) NE of here earthquakes near Tehama County
Siskiyou County, CA 138 km (86 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

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

  1. 1.5 36 km N of Chester, CA
  2. 2.1 21 km SE of Burney, CA
  3. 1.9 23 km SE of Fall River Mills, CA
  4. 2.1 27 km of Susanville, CA
  5. 2.1 11 km WSW of Fall River Mills, CA
  6. 2.1 9 km SE of McArthur, CA
  7. 2.0 13 km NNE of Burney, CA
  8. 1.6 21 km SSE of Burney, CA
  9. 1.9 40 km SSE of Fall River Mills, CA
  10. 2.4 14 km SE of McArthur, CA
  11. 1.7 18 km NNE of Burney, CA
  12. 2.3 36 km SSE of Fall River Mills, CA
  13. 1.6 35 km SSE of Fall River Mills, CA
  14. 1.9 5 km SE of Burney, CA
  15. 1.9 17 km N of McArthur, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.0 on 2023-09-08 — it released about 51,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.