QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

1km N of Vine Hill, CA

· 16 km deep · released about 46 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 17 kmSolano County 31 kmAlameda County 44 kmMarin County 57 kmNapa County 58 kmSan Mateo County 71 kmSan Joaquin County 73 kmYolo County 76 kmSacramento County 82 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 2.1 (md)
Depth
16 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Contra Costa County, 17 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2787 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 46 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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 38.0160, -122.0968. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 17 km (10 mi) NW of here earthquakes near Contra Costa County
Solano County, CA 31 km (19 mi) SSW of here earthquakes near Solano County
Alameda County, CA 44 km (27 mi) NNW of here earthquakes near Alameda County
Marin County, CA 57 km (35 mi) E of here earthquakes near Marin County
Napa County, CA 58 km (36 mi) SSE of here earthquakes near Napa County
San Mateo County, CA 71 km (44 mi) NNE of here earthquakes near San Mateo County

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

Aftershocks so far

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

  1. 2.2 3km ESE of Berkeley, CA
  2. 1.9 4km SE of Rodeo, CA
  3. 1.7 1km N of East Richmond Heights, CA
  4. 2.0 5km N of San Leandro, CA
  5. 1.8 3km S of Alamo, CA
  6. 1.7 4km ESE of American Canyon, CA
  7. 3.4 2km NE of Pacheco, CA
  8. 1.5 2km W of Crockett, CA
  9. 2.0 5km WSW of Yountville, CA
  10. 1.9 4km NE of Vallejo, CA
  11. 1.5 3km ESE of Rodeo, CA
  12. 1.5 12km E of Blackhawk, CA
  13. 2.6 4km ESE of Oakland, CA
  14. 2.9 3km ESE of Berkeley, CA
  15. 1.5 3km ENE of Oakland, 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 2,500 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.