QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

6 km SSW of Yountville, CA

· 10.0 km deep · released about 94 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 18 kmSolano County 41 kmMarin County 45 kmSonoma County 50 kmYolo County 56 kmContra Costa County 62 kmSan Francisco County 89 kmAlameda County 89 kmLake County 89 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 2.3 (md)
Depth
10.0 km below the surface
Felt
11 reports · strongest reported intensity III
Nearest
Napa County, 18 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 369 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 11 people have reported feeling it to USGS.

How big was it?

This earthquake released about 94 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 160,000× 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 10× the energy of this one
  4. This earthquake M 2.3 about 94 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 38.3522, -122.3963. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 18 km (11 mi) SSW of here earthquakes near Napa County
Solano County, CA 41 km (25 mi) WNW of here earthquakes near Solano County
Marin County, CA 45 km (28 mi) NE of here earthquakes near Marin County
Sonoma County, CA 50 km (31 mi) ESE of here earthquakes near Sonoma County
Yolo County, CA 56 km (35 mi) SW of here earthquakes near Yolo County
Contra Costa County, CA 62 km (38 mi) NW 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

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

  1. 2.2 11 km SE of Temelec, CA
  2. 2.1 4 km S of Green Valley, CA
  3. 2.0 4 km NE of Middletown, CA
  4. 1.9 10 km ESE of Hidden Valley Lake, CA
  5. 1.8 9 km E of Hidden Valley Lake, CA
  6. 2.1 7 km E of Vallejo, CA
  7. 1.8 2 km ENE of Rodeo, CA
  8. 1.9 14 km E of Angwin, CA
  9. 1.5 5 km E of Vallejo, CA
  10. 1.7 6 km WSW of Yountville, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2022-09-14 — it released about 1,200 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.