QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

15km ENE of Yountville, CA

· 9.2 km deep · released about 6.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 11 kmSolano County 32 kmYolo County 35 kmSonoma County 63 kmContra Costa County 65 kmMarin County 66 kmSacramento County 75 kmSutter County 77 kmColusa County 79 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 1.6 (md)
Depth
9.2 km below the surface
Felt
no reports yet
Nearest
Napa County, 11 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2222 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 6.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.8 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 38.4683, -122.2057. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 11 km (7 mi) ESE of here earthquakes near Napa County
Solano County, CA 32 km (20 mi) NW of here earthquakes near Solano County
Yolo County, CA 35 km (22 mi) SW of here earthquakes near Yolo County
Sonoma County, CA 63 km (39 mi) E of here earthquakes near Sonoma County
Contra Costa County, CA 65 km (40 mi) NNW of here earthquakes near Contra Costa County
Marin County, CA 66 km (41 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

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

  1. 2.0 8km N of Pittsburg, CA
  2. 2.0 4km N of Larkfield-Wikiup, CA
  3. 1.5 3km NNW of Benicia, CA
  4. 1.8 2km S of Angwin, CA
  5. 1.7 10km ENE of Hidden Valley Lake, CA
  6. 1.7 6km SW of Yountville, CA
  7. 2.3 14km E of Angwin, CA
  8. 1.6 8km W of Calistoga, CA
  9. 2.1 6km SSW of Yountville, CA
  10. 1.6 14km E of Angwin, CA
  11. 2.0 13km ESE of Angwin, CA
  12. 3.5 13km E of Angwin, CA
  13. 1.5 15km E of Angwin, CA
  14. 1.6 15km E of Angwin, CA
  15. 1.8 5km NNE of Black Point-Green Point, 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.