QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

5 km NNW of Pittsburg, CA

· 22 km deep · released about 85 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 17 kmSolano County 23 kmAlameda County 47 kmSan Joaquin County 58 kmNapa County 61 kmSacramento County 65 kmYolo County 68 kmMarin County 73 kmSan Mateo County 83 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
22 km below the surface
Felt
no reports yet
Nearest
Contra Costa County, 17 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 186 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 85 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 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 38.0655, -121.9102. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 17 km (10 mi) NNE of here earthquakes near Contra Costa County
Solano County, CA 23 km (14 mi) S of here earthquakes near Solano County
Alameda County, CA 47 km (29 mi) N of here earthquakes near Alameda County
San Joaquin County, CA 58 km (36 mi) WNW of here earthquakes near San Joaquin County
Napa County, CA 61 km (38 mi) SE of here earthquakes near Napa County
Sacramento County, CA 65 km (41 mi) SW of here earthquakes near Sacramento County

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

Aftershocks so far

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

  1. 1.7 3 km WSW of Alamo, CA
  2. 1.5 3 km WSW of Alamo, CA
  3. 2.1 3 km WSW of Alamo, CA
  4. 2.0 3 km WSW of Alamo, CA
  5. 2.2 3 km SW of Alamo, CA
  6. 2.0 4 km NE of San Leandro, CA
  7. 1.5 4 km NNW of Pittsburg, CA
  8. 1.8 5 km S of Pittsburg, CA
  9. 1.6 2 km SE of East Richmond Heights, CA
  10. 1.6 3 km NW of Hercules, CA
  11. 1.7 3 km NW of Hercules, CA
  12. 1.6 5 km ESE of San Ramon, CA
  13. 2.7 2 km ESE of Pinole, CA
  14. 1.8 5 km SSW of Antioch, CA
  15. 1.9 3 km ESE of Berkeley, 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 1,700 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.