QuakeIndex

quarry blast · reviewed by a seismologist

M 1.6md

5km E of Vallejo, CA

· -0.1 km deep · released about 6.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 27 kmContra Costa County 29 kmNapa County 45 kmMarin County 51 kmAlameda County 57 kmYolo County 67 kmSonoma County 80 kmSan Mateo County 80 kmSacramento County 81 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
-0.1 km below the surface
Felt
no reports yet
Nearest
Solano County, 27 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1639 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 6.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.6 about 6.4 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 38.1158, -122.1750. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 27 km (17 mi) SW of here earthquakes near Solano County
Contra Costa County, CA 29 km (18 mi) NW of here earthquakes near Contra Costa County
Napa County, CA 45 km (28 mi) SSE of here earthquakes near Napa County
Marin County, CA 51 km (31 mi) E of here earthquakes near Marin County
Alameda County, CA 57 km (35 mi) NNW of here earthquakes near Alameda County
Yolo County, CA 67 km (42 mi) SSW of here earthquakes near Yolo County

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

Aftershocks so far

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

  1. 1.7 12km E of Yountville, CA
  2. 1.8 2km E of Walnut Creek, CA
  3. 1.5 4km WNW of Orinda, CA
  4. 1.6 6km WNW of Dublin, CA
  5. 1.5 13km ESE of Angwin, CA
  6. 1.9 3km SW of American Canyon, CA
  7. 2.5 4km SSE of Rodeo, CA
  8. 1.8 2km SSE of Alamo, CA
  9. 2.2 3km W of Orinda, CA
  10. 2.3 3km W of Orinda, CA
  11. 1.6 8km SSE of Suisun City, CA
  12. 1.9 7km NNE of Penngrove, CA
  13. 1.6 3km E of Oakland, CA
  14. 1.6 5km E of Vallejo, CA
  15. 1.6 6km ESE of Penngrove, 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 23,000 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.