QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0md

2 km ESE of Blackhawk, California

· 14 km deep · released about 28 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 14 kmAlameda County 18 kmSolano County 51 kmSan Joaquin County 55 kmSan Mateo County 62 kmSanta Clara County 67 kmMarin County 81 kmStanislaus County 82 kmSacramento County 85 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 2.0 (md)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Contra Costa County, 14 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3301 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 28 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 540,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 380,000× the energy of this one
  3. Around the size people start to feel M 3.0 34× the energy of this one
  4. This earthquake M 2.0 about 28 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 37.8095, -121.8768. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 14 km (9 mi) SSE of here earthquakes near Contra Costa County
Alameda County, CA 18 km (11 mi) N of here earthquakes near Alameda County
Solano County, CA 51 km (32 mi) S of here earthquakes near Solano County
San Joaquin County, CA 55 km (34 mi) WSW of here earthquakes near San Joaquin County
San Mateo County, CA 62 km (38 mi) NE of here earthquakes near San Mateo County
Santa Clara County, CA 67 km (42 mi) NNW of here earthquakes near Santa Clara County

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

Aftershocks so far

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

  1. 2.3 2km NW of Pittsburg, CA
  2. 1.6 13km SSE of Livermore, CA
  3. 2.1 2km ENE of Berkeley, CA
  4. 1.6 2km E of Diablo, CA
  5. 1.6 6km ENE of Dublin, CA
  6. 2.0 9km ENE of Milpitas, CA
  7. 2.6 2km NNE of San Leandro, CA
  8. 1.7 5km NNE of San Leandro, CA
  9. 2.4 1km E of Pacheco, CA
  10. 1.7 1 km N of North Fair Oaks, California
  11. 2.1 3 km SSE of Rio Vista, California
  12. 2.0 10 km ENE of Milpitas, California
  13. 1.6 2 km NNW of Pleasant Hill, California
  14. 2.7 6km SE of Rio Vista, CA
  15. 2.0 3km E of Rio Vista, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.