QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7mw

6km SSW of Yountville, CA

· 8.0 km deep · released about 5.4 tons 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 3.7 (mw)
Depth
8.0 km below the surface
Felt
3571 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
Nearest
Napa County, 18 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2539 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3571 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× more

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 38.3515, -122.3983. 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 (26 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

14 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. 1.9 7km NE of Healdsburg, CA
  9. 1.7 7km NNW of Kenwood, CA
  10. 1.9 6km W of Yountville, CA
  11. 2.4 1km N of Vine Hill, CA
  12. 2.0 1km NNE of Pacheco, CA
  13. 2.0 12km NE of Napa, CA
  14. 1.8 8km W 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.

On USGS

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