QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

30km NNW of Forest Ranch, CA

· 16 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 38 kmButte County 55 kmShasta County 73 kmGlenn County 80 kmPlumas County 83 kmYuba County 103 kmColusa County 114 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
16 km below the surface
Felt
no reports yet
Nearest
Tehama County, 38 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1997 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 40.1365, -121.7813. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 38 km (24 mi) E of here earthquakes near Tehama County
Butte County, CA 55 km (34 mi) NNW of here earthquakes near Butte County
Shasta County, CA 73 km (45 mi) SSE of here earthquakes near Shasta County
Glenn County, CA 80 km (49 mi) NE of here earthquakes near Glenn County
Plumas County, CA 83 km (52 mi) WNW of here earthquakes near Plumas County
Yuba County, CA 103 km (64 mi) NNW of here earthquakes near Yuba County

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

Aftershocks so far

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

  1. 1.5 8km SSE of Mineral, CA
  2. 1.6 12km W of Chester, CA
  3. 1.7 7km SSE of Mineral, CA
  4. 1.6 12km N of Mineral, CA
  5. 1.9 3km NE of Viola, CA
  6. 1.6 9km S of Mineral, CA
  7. 2.1 14km ESE of Viola, CA
  8. 2.9 6km NNE of Hamilton City, CA
  9. 1.9 13km WSW of Almanor, CA
  10. 1.9 9km WSW of Chester, CA
  11. 1.5 12km ESE of Viola, CA
  12. 2.0 9km WSW of Chester, CA
  13. 1.5 12km ESE of Viola, CA
  14. 1.9 10km WSW of Chester, CA
  15. 2.5 6km NW of Chico, 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.