QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

2km SE of Grenada, CA

· 12 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Siskiyou County 6 kmJackson County 88 kmShasta County 105 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
12 km below the surface
Felt
no reports yet
Nearest
Siskiyou County, 6 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1300 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 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 41.6340, -122.5057. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Siskiyou County, CA 6 km (3 mi) NNE of here earthquakes near Siskiyou County
Jackson County, OR 88 km (54 mi) S of here earthquakes near Jackson County
Shasta County, CA 105 km (65 mi) NNW of here earthquakes near Shasta County
Trinity County, CA 121 km (75 mi) NNE of here earthquakes near Trinity County
Josephine County, OR 122 km (76 mi) SE of here earthquakes near Josephine County
Klamath County, OR 137 km (85 mi) SSW of here earthquakes near Klamath County

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

Aftershocks so far

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

  1. 2.0 13 km SSW of Tennant, CA
  2. 1.8 14 km NNE of McCloud, CA
  3. 1.6 12 km N of McCloud, CA
  4. 2.1 13 km N of McCloud, CA
  5. 1.7 13 km NNE of McCloud, CA
  6. 1.9 3 km WNW of Mount Shasta, CA
  7. 2.0 26 km ENE of Hornbrook, CA
  8. 1.8 14 km NNE of McCloud, CA
  9. 1.9 16 km SSW of Tennant, CA
  10. 1.8 16 km SSW of Tennant, CA
  11. 2.6 23 km WSW of Mount Hebron, CA
  12. 1.8 13 km NNE of McCloud, CA
  13. 1.9 12 km NNE of McCloud, CA
  14. 1.9 12 km NNE of McCloud, CA
  15. 2.5 6 km NW of Macdoel, 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.