QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

3km WNW of Crockett, CA

· 7.9 km deep · released about 9.3 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 30 kmSolano County 35 kmMarin County 44 kmNapa County 50 kmAlameda County 54 kmSan Mateo County 72 kmYolo County 75 kmSan Francisco County 78 kmSonoma County 79 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 1.7 (md)
Depth
7.9 km below the surface
Felt
no reports yet
Nearest
Contra Costa County, 30 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1265 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 9.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 100× the energy of this one
  4. This earthquake M 1.7 about 9.3 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 38.0588, -122.2445. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 30 km (19 mi) WNW of here earthquakes near Contra Costa County
Solano County, CA 35 km (22 mi) SW of here earthquakes near Solano County
Marin County, CA 44 km (27 mi) E of here earthquakes near Marin County
Napa County, CA 50 km (31 mi) S of here earthquakes near Napa County
Alameda County, CA 54 km (34 mi) NNW of here earthquakes near Alameda County
San Mateo County, CA 72 km (45 mi) N 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

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

  1. 2.7 3 km N of Piedmont, CA
  2. 1.8 9 km E of Blackhawk, CA
  3. 1.6 6 km E of Vallejo, CA
  4. 2.1 3 km NW of Castro Valley, CA
  5. 2.1 5 km ESE of Oakland, CA
  6. 1.6 4km E of Berkeley, CA
  7. 1.6 4km WNW of San Francisco Zoo, CA
  8. 1.6 7km S of Muir Beach, CA
  9. 2.0 3km SSW of Port Costa, CA
  10. 2.1 1km WNW of Kensington, CA
  11. 1.8 9km SW of Brentwood, CA
  12. 1.6 18km NE of Yountville, CA
  13. 1.7 2km ENE of Berkeley, CA
  14. 1.5 1km ENE of Vine Hill, CA
  15. 1.5 1km S of Green Valley, 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 16,000 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.