QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

6 km NE of Kenwood, CA

· 10 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 16 kmSonoma County 38 kmMarin County 49 kmSolano County 53 kmYolo County 58 kmContra Costa County 76 kmLake County 76 kmColusa County 84 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 1.8 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Napa County, 16 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1123 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 38.4495, -122.4970. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 16 km (10 mi) WSW of here earthquakes near Napa County
Sonoma County, CA 38 km (24 mi) ESE of here earthquakes near Sonoma County
Marin County, CA 49 km (31 mi) NNE of here earthquakes near Marin County
Solano County, CA 53 km (33 mi) WNW of here earthquakes near Solano County
Yolo County, CA 58 km (36 mi) WSW of here earthquakes near Yolo County
Contra Costa County, CA 76 km (47 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

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

  1. 2.7 4 km WNW of Cobb, CA
  2. 2.4 12 km SE of Middletown, CA
  3. 1.5 7 km NW of The Geysers, CA
  4. 1.6 15 km SE of Hidden Valley Lake, CA
  5. 1.5 12 km SE of Middletown, CA
  6. 1.8 2 km E of The Geysers, CA
  7. 2.3 12 km SE of Middletown, CA
  8. 1.5 12 km SE of Middletown, CA
  9. 1.6 12 km SE of Middletown, CA
  10. 2.1 6 km NW of The Geysers, CA
  11. 1.7 2 km N of The Geysers, CA
  12. 1.9 4 km WNW of The Geysers, CA
  13. 2.0 1 km NW of The Geysers, CA
  14. 1.6 1 km NNW of The Geysers, CA
  15. 1.6 7 km NW 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 10,000 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.