QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

11km NNE of Napa, CA

· 12 km deep · released about 100 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 16 kmSolano County 28 kmYolo County 43 kmContra Costa County 57 kmMarin County 59 kmSonoma County 63 kmSacramento County 77 kmSutter County 85 kmAlameda County 86 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 2.4 (md)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Napa County, 16 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2663 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 100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 150,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 110,000× the energy of this one
  3. Around the size people start to feel M 3.0 9.4× the energy of this one
  4. This earthquake M 2.4 about 100 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 38.3845, -122.2208. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 16 km (10 mi) SE of here earthquakes near Napa County
Solano County, CA 28 km (17 mi) WNW of here earthquakes near Solano County
Yolo County, CA 43 km (27 mi) SW of here earthquakes near Yolo County
Contra Costa County, CA 57 km (35 mi) NNW of here earthquakes near Contra Costa County
Marin County, CA 59 km (37 mi) NE of here earthquakes near Marin County
Sonoma County, CA 63 km (39 mi) ESE of here earthquakes near Sonoma County

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

Aftershocks so far

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

  1. 2.0 9km N of Pittsburg, CA
  2. 1.8 11km N of Bay Point, CA
  3. 2.6 10km ESE of Hidden Valley Lake, CA
  4. 2.6 10km ESE of Hidden Valley Lake, CA
  5. 2.2 6km WSW of Yountville, CA
  6. 1.6 1km W of Concord, CA
  7. 1.9 9km W of Woodland, CA
  8. 2.3 11km NE of Winters, CA
  9. 1.7 18km E of Angwin, CA
  10. 1.5 13km E of Angwin, CA
  11. 1.9 12km NNE of Angwin, CA
  12. 1.6 11km ESE of Hidden Valley Lake, CA
  13. 1.5 13km ESE of Angwin, CA
  14. 1.5 2km NW of Roseland, CA
  15. 2.3 8km SW of Calistoga, 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.