QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

12km W of Loma Rica, CA

· 35 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yuba County 19 kmSutter County 35 kmButte County 38 kmColusa County 61 kmNevada County 67 kmPlacer County 77 kmYolo County 78 kmGlenn County 79 kmSierra County 93 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
35 km below the surface
Felt
no reports yet
Nearest
Yuba County, 19 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2564 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 11 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 5.7 930,000× the energy of this one
  3. Around the size people start to feel M 3.0 83× the energy of this one
  4. This earthquake M 1.7 about 11 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 39.3272, -121.5503. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Yuba County, CA 19 km (12 mi) WNW of here earthquakes near Yuba County
Sutter County, CA 35 km (22 mi) NNE of here earthquakes near Sutter County
Butte County, CA 38 km (24 mi) S of here earthquakes near Butte County
Colusa County, CA 61 km (38 mi) ENE of here earthquakes near Colusa County
Nevada County, CA 67 km (42 mi) W of here earthquakes near Nevada County
Placer County, CA 77 km (48 mi) WNW of here earthquakes near Placer County

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

Aftershocks so far

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

  1. 3.9 15km E of Willows, CA
  2. 1.9 16km NW of Biggs, CA
  3. 1.8 16km E of Willows, CA
  4. 2.4 6km SSE of Challenge-Brownsville, CA
  5. 2.1 13km ESE of Willows, CA
  6. 2.0 8km ESE of Challenge-Brownsville, CA
  7. 1.9 11km N of Oroville, CA
  8. 2.1 15km E of Willows, CA
  9. 2.2 8km ESE of Challenge-Brownsville, CA
  10. 2.0 10km NNW of Oroville, CA
  11. 2.1 8km ENE of Loma Rica, CA
  12. 1.8 9km SSE of Challenge-Brownsville, CA
  13. 1.8 16km E of Willows, CA
  14. 1.7 11km W of Durham, CA
  15. 1.9 17km E of Willows, 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.