QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

1 km SSE of East Richmond Heights, California

· 5.7 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 31 kmMarin County 41 kmAlameda County 47 kmSolano County 49 kmSan Mateo County 58 kmNapa County 64 kmSan Francisco County 68 kmSonoma County 85 kmYolo County 90 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
5.7 km below the surface
Felt
no reports yet
Nearest
Contra Costa County, 31 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3516 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 12 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 870,000× the energy of this one
  3. Around the size people start to feel M 3.0 78× the energy of this one
  4. This earthquake M 1.7 about 12 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 37.9312, -122.3073. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 31 km (19 mi) W of here earthquakes near Contra Costa County
Marin County, CA 41 km (25 mi) ESE of here earthquakes near Marin County
Alameda County, CA 47 km (29 mi) NW of here earthquakes near Alameda County
Solano County, CA 49 km (31 mi) SW of here earthquakes near Solano County
San Mateo County, CA 58 km (36 mi) N of here earthquakes near San Mateo County
Napa County, CA 64 km (40 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

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

  1. 1.7 1 km N of Pacifica, California
  2. 1.7 4 km S of Pittsburg, California
  3. 1.6 2 km ESE of Waldon, California
  4. 1.8 9 km SW of Brentwood, California
  5. 2.2 1 km ENE of Pacifica, California
  6. 1.5 0 km NW of Concord, California
  7. 1.6 1 km S of Pacheco, California
  8. 2.2 1 km E of Pacheco, California
  9. 1.9 9 km S of Antioch, California
  10. 1.6 1 km ENE of Pacifica, California
  11. 2.5 3 km NNW of Piedmont, California
  12. 2.4 7 km S of Muir Beach, California
  13. 1.7 1 km E of North Gate, California
  14. 1.8 8 km SSW of Moskowite Corner, California
  15. 1.8 9 km ENE of Blackhawk, 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.