QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

9 km S of Hat Creek, California

· 9.3 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 44 kmLassen County 76 kmTehama County 92 kmPlumas County 103 kmModoc County 115 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
9.3 km below the surface
Felt
no reports yet
Nearest
Shasta County, 44 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3516 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 40.7482, -121.5188. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 44 km (27 mi) E of here earthquakes near Shasta County
Lassen County, CA 76 km (47 mi) W of here earthquakes near Lassen County
Tehama County, CA 92 km (57 mi) NE of here earthquakes near Tehama County
Plumas County, CA 103 km (64 mi) NW of here earthquakes near Plumas County
Modoc County, CA 115 km (72 mi) SW of here earthquakes near Modoc County
Siskiyou County, CA 126 km (78 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

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

  1. 1.7 6 km WNW of Cassel, California
  2. 2.2 4 km WNW of Cassel, California
  3. 1.8 4 km WSW of Cassel, California
  4. 1.7 5 km WNW of Cassel, California
  5. 1.8 5 km W of Cassel, California
  6. 1.7 5 km WNW of Cassel, California
  7. 2.3 6 km WNW of Cassel, California
  8. 2.8 6 km NNE of Burney, California
  9. 2.0 22 km NW of McArthur, California
  10. 1.6 6 km NW of Montgomery Creek, California
  11. 1.6 6 km NW of Montgomery Creek, California
  12. 1.9 21 km SSE of Nubieber, California
  13. 1.6 6 km W of Big Bend, California
  14. 1.5 7 km WNW of Old Station, California
  15. 2.2 6 km ESE of Mineral, California

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.