QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

10 km NNW of Chester, CA

· 10 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 59 kmLassen County 69 kmShasta County 76 kmButte County 82 kmTehama County 83 kmSierra County 111 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
10 km below the surface
Felt
no reports yet
Nearest
Plumas County, 59 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 648 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 21 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 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 40.3705, -121.3068. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 59 km (36 mi) NW of here earthquakes near Plumas County
Lassen County, CA 69 km (43 mi) WSW of here earthquakes near Lassen County
Shasta County, CA 76 km (47 mi) SE of here earthquakes near Shasta County
Butte County, CA 82 km (51 mi) NNE of here earthquakes near Butte County
Tehama County, CA 83 km (52 mi) ENE of here earthquakes near Tehama County
Sierra County, CA 111 km (69 mi) NW of here earthquakes near Sierra County

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

Aftershocks so far

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

  1. 1.6 2 km NNE of Prattville, CA
  2. 1.9 2 km ENE of Almanor, CA
  3. 1.8 4 km N of Canyondam, CA
  4. 1.8 0 km SSE of Almanor, CA
  5. 1.9 1 km NNW of Almanor, CA
  6. 2.1 4 km NW of Almanor, CA
  7. 1.7 11 km ESE of Mineral, CA
  8. 2.4 3 km NNW of Almanor, CA
  9. 2.1 19 km NNW of Belden, CA
  10. 1.6 14 km ESE of Viola, CA
  11. 1.7 5 km N of Almanor, CA
  12. 2.0 14 km WSW of Almanor, CA
  13. 2.3 3 km WNW of Paxton, CA
  14. 1.9 16 km NE of Mineral, CA
  15. 1.9 1 km SE of Prattville, 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 5.5 on 2023-05-11 — it released about 240,000 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.