QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

8 km ENE of Kenwood, CA

· 9.1 km deep · released about 94 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 14 kmSonoma County 42 kmSolano County 49 kmMarin County 49 kmYolo County 56 kmContra Costa County 72 kmLake County 79 kmColusa County 85 kmSan Francisco 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 2.3 (md)
Depth
9.1 km below the surface
Felt
5 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 1117 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 5 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 38.4320, -122.4580. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 14 km (9 mi) SW of here earthquakes near Napa County
Sonoma County, CA 42 km (26 mi) ESE of here earthquakes near Sonoma County
Solano County, CA 49 km (30 mi) WNW of here earthquakes near Solano County
Marin County, CA 49 km (31 mi) NNE of here earthquakes near Marin County
Yolo County, CA 56 km (35 mi) WSW of here earthquakes near Yolo County
Contra Costa County, CA 72 km (45 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

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

  1. 2.0 1 km NE of The Geysers, CA
  2. 1.9 12 km SE of Middletown, CA
  3. 1.6 14 km NNE of Angwin, CA
  4. 1.6 11 km ENE of Yountville, CA
  5. 1.6 12 km SE of Middletown, CA
  6. 1.6 12 km SE of Middletown, CA
  7. 1.8 12 km SE of Middletown, CA
  8. 1.5 3 km E of The Geysers, CA
  9. 2.4 12 km SE of Middletown, CA
  10. 1.6 15 km SE of Hidden Valley Lake, CA
  11. 1.5 12 km SE of Middletown, CA
  12. 1.8 2 km E of The Geysers, CA
  13. 2.3 12 km SE of Middletown, CA
  14. 1.5 12 km SE of Middletown, CA
  15. 1.6 12 km SE of Middletown, 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 1,500 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.