QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

13 km NNE of Pittsburg, CA

· 27 km deep · released about 720 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 16 kmContra Costa County 26 kmAlameda County 55 kmSan Joaquin County 55 kmSacramento County 56 kmNapa County 59 kmYolo County 60 kmMarin County 79 kmSan Mateo 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 2.9 (ml)
Depth
27 km below the surface
Felt
33 reports · strongest reported intensity III
Nearest
Solano County, 16 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 475 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 33 people have reported feeling it to USGS.

How big was it?

This earthquake released about 720 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 21,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 15,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.3× the energy of this one
  4. This earthquake M 2.9 about 720 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 38.1385, -121.8472. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 16 km (10 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 55 km (34 mi) N of here earthquakes near Alameda County
San Joaquin County, CA 55 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 (36 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

54 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 200 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.