QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2mw

14 km E of Angwin, California

· 4.8 km deep · released about 1.1 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 7 kmYolo County 36 kmSolano County 44 kmSonoma County 56 kmColusa County 69 kmMarin County 69 kmLake County 73 kmSutter County 73 kmContra Costa County 77 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 3.2 (mw)
Depth
4.8 km below the surface
Felt
5 reports · strongest reported intensity II
Nearest
Napa County, 7 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1741 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 150,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,900× the energy of this one
  4. This earthquake M 3.2 about 1.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.3× more

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 38.5592, -122.2873. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 7 km (4 mi) NNE of here earthquakes near Napa County
Yolo County, CA 36 km (22 mi) WSW of here earthquakes near Yolo County
Solano County, CA 44 km (28 mi) NW of here earthquakes near Solano County
Sonoma County, CA 56 km (35 mi) E of here earthquakes near Sonoma County
Colusa County, CA 69 km (43 mi) S of here earthquakes near Colusa County
Marin County, CA 69 km (43 mi) NE of here earthquakes near Marin County

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

Aftershocks so far

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

  1. 1.9 7 km S of Calistoga, California
  2. 1.9 4 km SW of Cobb, California
  3. 1.5 2 km E of Saint Helena, California
  4. 2.7 4 km S of Cobb, California
  5. 2.6 5 km SW of Cobb, California
  6. 1.6 6 km SW of Cobb, California
  7. 1.5 9 km S of Cobb, California
  8. 1.7 6 km S of Cobb, California
  9. 1.6 7 km W of Middletown, California
  10. 1.6 7 km W of Middletown, California
  11. 1.8 3 km S of Cobb, California
  12. 1.6 7 km S of Cobb, California
  13. 1.6 2 km S of Cobb, California
  14. 1.6 3 km S of Cobb, California
  15. 1.8 3 km SSW of Cobb, California

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.