QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

12 km SE of Suisun City, CA

· 16 km deep · released about 8.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 10 kmContra Costa County 30 kmNapa County 51 kmYolo County 55 kmSacramento County 58 kmAlameda County 60 kmSan Joaquin County 62 kmMarin County 75 kmSan Mateo County 95 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 1.6 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Solano County, 10 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 746 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 8.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 8.7 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 38.1833, -121.9092. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 10 km (6 mi) SSE of here earthquakes near Solano County
Contra Costa County, CA 30 km (18 mi) N of here earthquakes near Contra Costa County
Napa County, CA 51 km (32 mi) SE of here earthquakes near Napa County
Yolo County, CA 55 km (34 mi) S of here earthquakes near Yolo County
Sacramento County, CA 58 km (36 mi) WSW of here earthquakes near Sacramento County
Alameda County, CA 60 km (37 mi) N of here earthquakes near Alameda 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. 2.4 12 km SSE of Suisun City, CA
  2. 1.6 5 km E of Vallejo, CA
  3. 3.0 6 km SW of Clayton, CA
  4. 1.8 5 km SW of Clayton, CA
  5. 1.9 5 km SW of Clayton, CA
  6. 1.8 11 km E of Yountville, CA
  7. 2.2 2 km NNW of Blackhawk, CA
  8. 1.7 1 km of Pleasant Hill, CA
  9. 1.8 3 km SSW of American Canyon, CA
  10. 1.8 9 km W of Rio Vista, CA
  11. 2.2 6 km E of Vallejo, CA
  12. 1.7 7 km NNE of Bay Point, CA
  13. 1.9 1 km SW of Pacheco, CA
  14. 1.6 5 km E of Green Valley, CA
  15. 2.7 1 km SSW of Alamo, 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 17,000 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.