QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0mw

1 km WSW of Kensington, California

· 4.6 km deep · released about 1,000 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 30 kmMarin County 43 kmAlameda County 44 kmSolano County 50 kmSan Mateo County 55 kmNapa County 67 kmSan Francisco County 68 kmSonoma County 88 kmSan Joaquin County 90 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 3.0 (mw)
Depth
4.6 km below the surface
Felt
2234 reports · strongest reported intensity IV
Nearest
Contra Costa County, 30 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 904 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2234 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,000 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 330,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 10,000× the energy of this one
  4. This earthquake M 3.0 about 1,000 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 37.9085, -122.2923. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 30 km (19 mi) W of here earthquakes near Contra Costa County
Marin County, CA 43 km (27 mi) ESE of here earthquakes near Marin County
Alameda County, CA 44 km (28 mi) NW of here earthquakes near Alameda County
Solano County, CA 50 km (31 mi) SW of here earthquakes near Solano County
San Mateo County, CA 55 km (34 mi) N of here earthquakes near San Mateo County
Napa County, CA 67 km (41 mi) S of here earthquakes near Napa County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.9 3 km SE of Rodeo, California
  2. 2.0 6 km SSW of Yountville, California
  3. 1.7 7 km W of San Ramon, California
  4. 1.6 2 km ENE of Alameda, California
  5. 1.7 2 km E of Berkeley, California
  6. 1.5 2 km ESE of Berkeley, California
  7. 1.6 1 km NNW of Crockett, California
  8. 2.7 1 km SE of Pacheco, California
  9. 2.0 1 km W of Kensington, California
  10. 1.7 3 km NNE of Danville, California
  11. 2.0 2 km ESE of Blackhawk, California
  12. 2.1 1 km ESE of Diablo, California
  13. 2.0 2 km SW of Alamo, California
  14. 2.1 4 km E of Union City, California
  15. 1.8 2 km NNE of North Gate, California

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.