QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

15km ESE of Suisun City, CA

· 22 km deep · released about 700 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 12 kmContra Costa County 30 kmNapa County 54 kmSacramento County 55 kmYolo County 56 kmSan Joaquin County 59 kmAlameda County 59 kmMarin County 78 kmSan Mateo County 96 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 (md)
Depth
22 km below the surface
Felt
12 reports · strongest reported intensity III
Nearest
Solano County, 12 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2975 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 12 people have reported feeling it to USGS.

How big was it?

This earthquake released about 700 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 22,000× 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 1.4× the energy of this one
  4. This earthquake M 2.9 about 700 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 38.1772, -121.8693. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 12 km (7 mi) SSE of here earthquakes near Solano County
Contra Costa County, CA 30 km (18 mi) NNE of here earthquakes near Contra Costa County
Napa County, CA 54 km (34 mi) SE of here earthquakes near Napa County
Sacramento County, CA 55 km (34 mi) WSW of here earthquakes near Sacramento County
Yolo County, CA 56 km (35 mi) S of here earthquakes near Yolo County
San Joaquin County, CA 59 km (37 mi) WNW 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

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

  1. 1.7 1km E of Pacheco, CA
  2. 1.6 5km E of San Ramon, CA
  3. 1.8 6km SSW of Yountville, CA
  4. 1.6 8km SW of Napa, CA
  5. 2.4 2km NW of Pittsburg, CA
  6. 2.5 1km WNW of Crockett, CA
  7. 1.8 9km ENE of Napa, CA
  8. 2.3 3km E of Pacheco, CA
  9. 1.6 1km ESE of East Richmond Heights, CA
  10. 2.5 3km ENE of Oakland, CA
  11. 1.7 2km NNW of Crockett, CA
  12. 2.4 1km NW of Crockett, CA
  13. 1.7 6km NE of Blackhawk, CA
  14. 1.6 2km NW of Crockett, CA
  15. 2.7 2km NW of Crockett, 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 4.4 on 2018-01-04 — it released about 160 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.