QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

11km ENE of Yountville, CA

· 7.1 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 11 kmSolano County 32 kmYolo County 40 kmSonoma County 61 kmMarin County 61 kmContra Costa County 62 kmSacramento County 78 kmSutter County 82 kmColusa County 83 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
7.1 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Napa County, 11 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2013 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

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 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× 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 38.4327, -122.2373. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 11 km (7 mi) SE of here earthquakes near Napa County
Solano County, CA 32 km (20 mi) NW of here earthquakes near Solano County
Yolo County, CA 40 km (25 mi) SW of here earthquakes near Yolo County
Sonoma County, CA 61 km (38 mi) E of here earthquakes near Sonoma County
Marin County, CA 61 km (38 mi) NE of here earthquakes near Marin County
Contra Costa County, CA 62 km (39 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

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

  1. 2.0 15km NNE of Angwin, CA
  2. 2.2 15km NNE of Angwin, CA
  3. 1.5 8km SE of Middletown, CA
  4. 1.9 5km W of Glen Ellen, CA
  5. 1.7 6km SW of Calistoga, CA
  6. 2.1 6km W of Yountville, CA
  7. 1.5 4km SW of Glen Ellen, CA
  8. 1.5 5km E of Vallejo, CA
  9. 1.6 4km W of Kenwood, CA
  10. 1.9 10km SSE of Elmira, CA
  11. 1.6 6km SSW of Calistoga, CA
  12. 1.6 21km ENE of Hidden Valley Lake, CA
  13. 1.6 3km NNW of Angwin, CA
  14. 1.6 6km SSW of Calistoga, CA
  15. 3.3 6km S 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.