QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0md

3 km W of Orinda, California

· 10 km deep · released about 33 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 24 kmAlameda County 37 kmMarin County 50 kmSolano County 50 kmSan Mateo County 53 kmNapa County 71 kmSan Francisco County 73 kmSan Joaquin County 84 kmSanta Clara County 87 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
10 km below the surface
Felt
no reports yet
Nearest
Contra Costa County, 24 km ENE
Nearest mapped fault
Hayward fault, 2 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3517 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 33 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 5.8 450,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 320,000× the energy of this one
  3. Around the size people start to feel M 3.0 29× the energy of this one
  4. This earthquake M 2.0 about 33 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 37.8768, -122.2222. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 24 km (15 mi) W of here earthquakes near Contra Costa County
Alameda County, CA 37 km (23 mi) NW of here earthquakes near Alameda County
Marin County, CA 50 km (31 mi) ESE of here earthquakes near Marin County
Solano County, CA 50 km (31 mi) SSW of here earthquakes near Solano County
San Mateo County, CA 53 km (33 mi) NNE of here earthquakes near San Mateo County
Napa County, CA 71 km (44 mi) S of here earthquakes near Napa County

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

Aftershocks so far

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

  1. 1.6 1 km ENE of Pacifica, California
  2. 2.5 3 km NNW of Piedmont, California
  3. 2.4 7 km S of Muir Beach, California
  4. 1.7 1 km E of North Gate, California
  5. 1.8 9 km ENE of Blackhawk, California
  6. 1.7 5 km SW of Alamo, California
  7. 1.7 2 km E of Pacifica, California
  8. 1.6 1 km SSW of Concord, California
  9. 1.6 0 km S of Concord, California
  10. 2.2 1 km SW of Concord, California
  11. 2.0 3 km SSE of Piedmont, California
  12. 1.8 1 km ENE of Pacifica, California
  13. 1.7 0 km SSE of Concord, California
  14. 2.4 3 km ENE of Vallejo, California
  15. 2.0 1 km S of Hillsborough, California

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.