QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

1 km E of Pacheco, California

· 18 km deep · released about 58 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 11 kmSolano County 33 kmAlameda County 39 kmMarin County 61 kmNapa County 63 kmSan Joaquin County 69 kmSan Mateo County 69 kmYolo County 79 kmSacramento County 81 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 2.2 (md)
Depth
18 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Contra Costa County, 11 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3502 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 58 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 260,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 58 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 37.9810, -122.0542. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 11 km (7 mi) NW of here earthquakes near Contra Costa County
Solano County, CA 33 km (21 mi) SSW of here earthquakes near Solano County
Alameda County, CA 39 km (24 mi) NNW of here earthquakes near Alameda County
Marin County, CA 61 km (38 mi) E of here earthquakes near Marin County
Napa County, CA 63 km (39 mi) SSE of here earthquakes near Napa County
San Joaquin County, CA 69 km (43 mi) W of here earthquakes near San Joaquin County

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

Aftershocks so far

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

  1. 1.7 3 km SE of North Gate, California
  2. 1.5 1 km W of Concord, California
  3. 2.1 2 km SSE of Livermore, California
  4. 1.6 0 km N of Contra Costa Centre, California
  5. 2.3 1 km ENE of Pacheco, California
  6. 2.1 1 km N of Pleasant Hill, California
  7. 2.5 1 km NNW of Pleasant Hill, California
  8. 1.7 1 km ENE of Berkeley, California
  9. 2.3 2 km N of Union City, California
  10. 1.9 1 km NE of Waldon, California
  11. 1.6 1 km ESE of Pacheco, California
  12. 2.7 1 km ESE of Pacheco, California
  13. 1.6 4 km W of Pleasant Hill, California
  14. 2.1 1 km SSE of Livermore, California
  15. 2.6 2 km SSE of Livermore, 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.