QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

6km W of Yountville, CA

· 8.3 km deep · released about 150 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 14 kmSonoma County 45 kmSolano County 46 kmMarin County 49 kmYolo County 55 kmContra Costa County 69 kmLake County 82 kmColusa County 87 kmSan Francisco County 92 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 2.5 (md)
Depth
8.3 km below the surface
Felt
28 reports · strongest reported intensity III
Nearest
Napa County, 14 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2164 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 28 people have reported feeling it to USGS.

How big was it?

This earthquake released about 150 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 72,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.5× the energy of this one
  4. This earthquake M 2.5 about 150 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 38.4098, -122.4293. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 14 km (9 mi) SW of here earthquakes near Napa County
Sonoma County, CA 45 km (28 mi) ESE of here earthquakes near Sonoma County
Solano County, CA 46 km (28 mi) WNW of here earthquakes near Solano County
Marin County, CA 49 km (30 mi) NE of here earthquakes near Marin County
Yolo County, CA 55 km (34 mi) WSW of here earthquakes near Yolo County
Contra Costa County, CA 69 km (43 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

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

  1. 1.5 8km WNW of Yountville, CA
  2. 2.7 2km SSE of Crockett, CA
  3. 2.2 3km SW of Anderson Springs, CA
  4. 1.6 6km ESE of Santa Rosa, CA
  5. 1.7 2km ENE of The Geysers, CA
  6. 1.8 4km SSE of The Geysers, CA
  7. 1.7 6km E of Santa Rosa, CA
  8. 1.7 3km W of Anderson Springs, CA
  9. 1.8 3km SE of The Geysers, CA
  10. 1.6 15km ENE of Yountville, CA
  11. 1.9 13km ENE of Yountville, CA
  12. 2.1 6km SW of Calistoga, CA
  13. 1.9 7km WSW of Kenwood, CA
  14. 2.3 2km WSW of Anderson Springs, CA
  15. 1.9 11km ENE of Healdsburg, 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 4.2 on 2018-01-18 — it released about 440 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.