QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

12 km NNE of Pittsburg, CA

· 28 km deep · released about 82 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 17 kmContra Costa County 26 kmAlameda County 54 kmSan Joaquin County 54 kmSacramento County 56 kmNapa County 59 kmYolo County 61 kmMarin County 80 kmSan Mateo County 92 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
28 km below the surface
Felt
no reports yet
Nearest
Solano County, 17 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 534 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 82 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 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 82 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 38.1323, -121.8403. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 17 km (11 mi) SSE of here earthquakes near Solano County
Contra Costa County, CA 26 km (16 mi) NNE of here earthquakes near Contra Costa County
Alameda County, CA 54 km (34 mi) N of here earthquakes near Alameda County
San Joaquin County, CA 54 km (34 mi) WNW of here earthquakes near San Joaquin County
Sacramento County, CA 56 km (35 mi) SW of here earthquakes near Sacramento County
Napa County, CA 59 km (37 mi) SE of here earthquakes near Napa County

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

Aftershocks so far

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

  1. 1.9 5 km WNW of Dublin, CA
  2. 1.7 3 km NNE of Dublin, CA
  3. 1.8 7 km E of Vallejo, CA
  4. 1.5 3 km SW of Clayton, CA
  5. 1.9 3 km ESE of Walnut Creek, CA
  6. 1.9 6 km SE of Moraga, CA
  7. 2.2 13 km SE of Suisun City, CA
  8. 2.7 6 km ESE of Clayton, CA
  9. 1.6 5 km E of Vallejo, CA
  10. 2.0 3 km WSW of Country Club, CA
  11. 2.1 4 km SE of Rodeo, CA
  12. 1.6 3 km SE of Rodeo, CA
  13. 3.2 2 km NW of Pinole, CA
  14. 1.5 3 km WSW of San Ramon, CA
  15. 1.7 2 km SSE of Danville, 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 2019-10-15 — it released about 1,800 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.