QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

8km NW of Montgomery Creek, CA

· 17 km deep · released about 9.3 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 15 kmTehama County 87 kmSiskiyou County 90 kmTrinity County 99 kmLassen County 117 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
17 km below the surface
Felt
no reports yet
Nearest
Shasta County, 15 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2551 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 9.3 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 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 100× the energy of this one
  4. This earthquake M 1.7 about 9.3 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 40.8895, -121.9883. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 15 km (9 mi) NNE of here earthquakes near Shasta County
Tehama County, CA 87 km (54 mi) NNE of here earthquakes near Tehama County
Siskiyou County, CA 90 km (56 mi) SSE of here earthquakes near Siskiyou County
Trinity County, CA 99 km (61 mi) ENE of here earthquakes near Trinity County
Lassen County, CA 117 km (73 mi) W of here earthquakes near Lassen County
Modoc County, CA 132 km (82 mi) SW 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. 1.5 8km NE of Shasta Lake, CA
  2. 2.1 12km WSW of Shingletown, CA
  3. 1.7 10km NE of Shasta Lake, CA
  4. 1.7 3km WSW of Shasta Lake, CA
  5. 2.1 4km WSW of Shasta Lake, CA
  6. 1.6 16km NE of Shasta Lake, CA
  7. 2.3 10km NNW of Viola, CA
  8. 1.6 2km WSW of Shasta Lake, CA
  9. 1.6 7km SSW of Big Bend, CA
  10. 1.7 7km SSW of Big Bend, CA
  11. 1.8 11km NW of Shingletown, CA
  12. 1.6 7km SSW of Big Bend, CA
  13. 1.6 9km NE of Shasta Lake, CA
  14. 1.6 11km WNW of Big Bend, CA
  15. 1.6 4km NNW of Palo Cedro, 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.