QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

12km ENE of French Gulch, CA

· 20 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 39 kmTrinity County 53 kmTehama County 72 kmSiskiyou 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 1.8 (md)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Shasta County, 39 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2742 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 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 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 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 40.7403, -122.5015. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 39 km (24 mi) W of here earthquakes near Shasta County
Trinity County, CA 53 km (33 mi) ENE of here earthquakes near Trinity County
Tehama County, CA 72 km (45 mi) NNW of here earthquakes near Tehama County
Siskiyou County, CA 94 km (59 mi) S of here earthquakes near Siskiyou County
Butte County, CA 142 km (88 mi) NNW of here earthquakes near Butte County

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

Aftershocks so far

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

  1. 1.7 9km NE of Shasta Lake, CA
  2. 2.4 26km WNW of Montgomery Creek, CA
  3. 2.0 27km N of Shasta Lake, CA
  4. 1.5 3km SSE of Bella Vista, CA
  5. 1.7 9km NE of Shasta Lake, CA
  6. 1.9 16km NNE of Bella Vista, CA
  7. 1.7 11km NE of Shasta Lake, CA
  8. 1.7 2km NW of Shasta Lake, CA
  9. 1.7 6km NE of Shasta Lake, CA
  10. 1.5 9km NNE of Shasta Lake, CA
  11. 1.7 8km NW of Montgomery Creek, CA
  12. 1.9 8km SW of Dunsmuir, CA
  13. 1.6 3km SW of Shasta Lake, CA
  14. 1.6 14km NNE of French Gulch, CA
  15. 1.7 13km NNE of French Gulch, 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.