QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

13km E of Yountville, CA

· 7.6 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 13 kmSolano County 30 kmYolo County 40 kmContra Costa County 60 kmMarin County 62 kmSonoma County 63 kmSacramento County 76 kmSutter County 82 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 1.8 (md)
Depth
7.6 km below the surface
Felt
no reports yet
Nearest
Napa County, 13 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2784 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 16 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 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 38.4210, -122.2180. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 13 km (8 mi) SE of here earthquakes near Napa County
Solano County, CA 30 km (18 mi) NW of here earthquakes near Solano County
Yolo County, CA 40 km (25 mi) SW of here earthquakes near Yolo County
Contra Costa County, CA 60 km (38 mi) NNW of here earthquakes near Contra Costa County
Marin County, CA 62 km (38 mi) NE of here earthquakes near Marin County
Sonoma County, CA 63 km (39 mi) E of here earthquakes near Sonoma County

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

Aftershocks so far

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

  1. 1.9 7km N of Kenwood, CA
  2. 2.6 10km NNE of Napa, CA
  3. 2.9 4km N of Rodeo, CA
  4. 1.6 10km ESE of Black Point-Green Point, CA
  5. 2.5 9km ESE of Black Point-Green Point, CA
  6. 2.8 9km ESE of Black Point-Green Point, CA
  7. 2.2 6km SE of Calistoga, CA
  8. 1.7 7km NNW of Kenwood, CA
  9. 1.9 6km W of Yountville, CA
  10. 2.4 1km N of Vine Hill, CA
  11. 2.0 1km NNE of Pacheco, CA
  12. 2.0 12km NE of Napa, CA
  13. 1.8 8km W of Yountville, CA
  14. 3.7 6km SSW of Yountville, CA
  15. 2.1 1km N of Pacheco, 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.