QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

15km NE of Woodland, CA

· 14 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yolo County 25 kmSutter County 31 kmSacramento County 43 kmSolano County 61 kmYuba County 62 kmNapa County 66 kmColusa County 70 kmPlacer County 86 kmAmador County 92 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
14 km below the surface
Felt
no reports yet
Nearest
Yolo County, 25 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3145 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 38.7638, -121.6345. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Yolo County, CA 25 km (16 mi) ENE of here earthquakes near Yolo County
Sutter County, CA 31 km (19 mi) S of here earthquakes near Sutter County
Sacramento County, CA 43 km (27 mi) NW of here earthquakes near Sacramento County
Solano County, CA 61 km (38 mi) NNE of here earthquakes near Solano County
Yuba County, CA 62 km (38 mi) SSW of here earthquakes near Yuba County
Napa County, CA 66 km (41 mi) ENE of here earthquakes near Napa County

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

Aftershocks so far

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

  1. 1.8 1 km WSW of Granite Bay, CA
  2. 2.1 2 km WSW of Granite Bay, CA
  3. 2.6 2 km NW of Granite Bay, CA
  4. 2.2 9 km SSW of South Yuba City, CA
  5. 2.4 5 km NE of Dunnigan, CA
  6. 1.9 7 km E of Arbuckle, CA
  7. 1.6 5 km WSW of Dunnigan, CA
  8. 2.3 6 km NW of Dunnigan, CA
  9. 2.9 10 km NW of Dunnigan, CA
  10. 2.4 9 km SSW of Arbuckle, CA
  11. 2.4 10 km SSW of Arbuckle, CA
  12. 1.8 9 km SSW of Arbuckle, CA
  13. 2.4 4 km SSW of Dunnigan, CA
  14. 2.3 7 km WSW of Dunnigan, CA
  15. 2.1 8 km WSW of Dunnigan, 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.