QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

6 km WSW of Kenwood, CA

· 4.9 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 28 kmSonoma County 31 kmMarin County 40 kmSolano County 60 kmYolo County 70 kmContra Costa County 78 kmLake County 81 kmSan Francisco County 82 kmColusa County 93 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 3.1 (ml)
Depth
4.9 km below the surface
Felt
320 reports · strongest reported intensity III
Nearest
Napa County, 28 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 214 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 320 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 38.3910, -122.6120. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 28 km (17 mi) WSW of here earthquakes near Napa County
Sonoma County, CA 31 km (19 mi) ESE of here earthquakes near Sonoma County
Marin County, CA 40 km (25 mi) NNE of here earthquakes near Marin County
Solano County, CA 60 km (37 mi) WNW of here earthquakes near Solano County
Yolo County, CA 70 km (43 mi) WSW of here earthquakes near Yolo County
Contra Costa County, CA 78 km (48 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

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

  1. 2.8 5 km NNW of The Geysers, CA
  2. 2.3 3 km SSW of Cobb, CA
  3. 1.6 5 km WSW of Glen Ellen, CA
  4. 2.3 5 km W of Glen Ellen, CA
  5. 2.4 5 km W of Glen Ellen, CA
  6. 2.1 5 km W of Glen Ellen, CA
  7. 3.3 6 km SW of Kenwood, CA
  8. 1.5 6 km SW of Kenwood, CA
  9. 3.1 6 km SW of Kenwood, CA
  10. 4.0 6 km W of Glen Ellen, CA
  11. 1.5 2 km NNE of The Geysers, CA
  12. 2.4 7 km WSW of Kenwood, CA
  13. 1.6 4 km W of Cobb, CA
  14. 1.7 2 km NE of The Geysers, CA
  15. 1.7 3 km ENE of The Geysers, 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 4.5 on 2023-06-03 — it released about 110 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.