QuakeIndex

quarry blast · reviewed by a seismologist

M 1.9md

6km E of Vallejo, CA

· -0.1 km deep · released about 21 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 46 kmMarin County 51 kmAlameda County 57 kmYolo County 67 kmSan Mateo County 80 kmSonoma County 80 kmSan Joaquin 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 1.9 (md)
Depth
-0.1 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Solano County, 27 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1748 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 38.1125, -122.1718. 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 46 km (29 mi) SSE of here earthquakes near Napa County
Marin County, CA 51 km (32 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

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

  1. 1.5 13km N of Green Valley, CA
  2. 1.5 5km E of Vallejo, CA
  3. 2.2 5km WSW of Kenwood, CA
  4. 2.0 2km E of Pacheco, CA
  5. 2.2 2km NW of Diablo, CA
  6. 2.1 3km NE of Berkeley, CA
  7. 2.1 5km WSW of Kenwood, CA
  8. 1.9 4km NNW of Crockett, CA
  9. 1.8 3km W of American Canyon, CA
  10. 1.5 8km WSW of Brentwood, CA
  11. 2.3 4km SSE of Vallejo, CA
  12. 2.1 5km NE of Kenwood, CA
  13. 2.8 1km ENE of El Cerrito, CA
  14. 1.8 5km ESE of Blackhawk, CA
  15. 1.6 5km E of Vallejo, 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 7,200 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.