QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

7km SSW of Big Bend, CA

· 14 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 24 kmSiskiyou County 85 kmTehama County 96 kmTrinity County 104 kmLassen County 116 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 1.7 (md)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Shasta County, 24 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2223 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 12 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 900,000× the energy of this one
  3. Around the size people start to feel M 3.0 80× the energy of this one
  4. This earthquake M 1.7 about 12 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 40.9633, -121.9552. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 24 km (15 mi) NNE of here earthquakes near Shasta County
Siskiyou County, CA 85 km (53 mi) SE of here earthquakes near Siskiyou County
Tehama County, CA 96 km (60 mi) NNE of here earthquakes near Tehama County
Trinity County, CA 104 km (64 mi) ENE of here earthquakes near Trinity County
Lassen County, CA 116 km (72 mi) WNW of here earthquakes near Lassen County
Modoc County, CA 125 km (78 mi) WSW of here earthquakes near Modoc County

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

Aftershocks so far

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

  1. 2.0 18km WNW of Round Mountain, CA
  2. 1.6 9km E of Millville, CA
  3. 2.9 25km N of Shasta Lake, CA
  4. 1.7 29km N of Shasta Lake, CA
  5. 1.7 10km NE of Shasta Lake, CA
  6. 2.0 10km WNW of Viola, CA
  7. 1.8 9km ESE of Millville, CA
  8. 2.1 9km NNE of Burney, CA
  9. 1.8 14km NNW of Viola, CA
  10. 1.6 23km N of Shasta Lake, CA
  11. 2.0 2km ENE of Montgomery Creek, CA
  12. 1.9 28km N of Shasta Lake, CA
  13. 2.0 7km ESE of McCloud, CA
  14. 1.5 16km NNW of Shingletown, CA
  15. 2.1 26km N of Shasta Lake, 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.