QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

10km ENE of Yountville, CA

· 8.2 km deep · released about 22 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 12 kmSolano County 32 kmYolo County 42 kmMarin County 60 kmSonoma County 60 kmContra Costa County 61 kmSacramento County 79 kmSutter County 83 kmColusa County 84 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 1.9 (md)
Depth
8.2 km below the surface
Felt
no reports yet
Nearest
Napa County, 12 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3034 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 22 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 680,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 480,000× the energy of this one
  3. Around the size people start to feel M 3.0 43× the energy of this one
  4. This earthquake M 1.9 about 22 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 38.4202, -122.2467. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 12 km (7 mi) SE of here earthquakes near Napa County
Solano County, CA 32 km (20 mi) WNW of here earthquakes near Solano County
Yolo County, CA 42 km (26 mi) SW of here earthquakes near Yolo County
Marin County, CA 60 km (37 mi) NE of here earthquakes near Marin County
Sonoma County, CA 60 km (37 mi) E of here earthquakes near Sonoma County
Contra Costa County, CA 61 km (38 mi) NNW of here earthquakes near Contra Costa County

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

Aftershocks so far

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

  1. 1.9 7km ENE of Angwin, CA
  2. 1.8 4km NE of Angwin, CA
  3. 1.7 7km ENE of Penngrove, CA
  4. 2.0 6km NNE of Penngrove, CA
  5. 2.9 6km NNE of Penngrove, CA
  6. 2.4 6km NNE of Penngrove, CA
  7. 1.8 2km NNE of Middletown, CA
  8. 1.9 20km E of Angwin, CA
  9. 1.5 14km E of Angwin, CA
  10. 1.7 11km NE of Napa, CA
  11. 2.3 3km N of Rodeo, CA
  12. 1.6 11km ESE of Hidden Valley Lake, CA
  13. 2.0 8km N of Pittsburg, CA
  14. 1.7 13km ENE of Hidden Valley Lake, 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.