QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

0 km E of Hayward, California

· 5.3 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 14 kmContra Costa County 30 kmSan Mateo County 39 kmSanta Clara County 60 kmSolano County 68 kmMarin County 73 kmSanta Cruz County 73 kmSan Joaquin County 76 kmSan Francisco 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 1.8 (md)
Depth
5.3 km below the surface
Felt
no reports yet
Nearest
Alameda County, 14 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3323 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 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 37.6685, -122.0698. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 14 km (9 mi) W of here earthquakes near Alameda County
Contra Costa County, CA 30 km (19 mi) SSW of here earthquakes near Contra Costa County
San Mateo County, CA 39 km (24 mi) NE of here earthquakes near San Mateo County
Santa Clara County, CA 60 km (37 mi) NW of here earthquakes near Santa Clara County
Solano County, CA 68 km (42 mi) S of here earthquakes near Solano County
Marin County, CA 73 km (45 mi) SE of here earthquakes near Marin County

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

Aftershocks so far

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

  1. 1.7 1 km SSW of Clyde, California
  2. 1.7 1 km SW of Clyde, California
  3. 2.3 2 km WSW of Clyde, California
  4. 1.5 1 km SSE of Clyde, California
  5. 1.7 1 km WNW of Concord, California
  6. 1.9 3 km SE of Rodeo, California
  7. 1.7 7 km W of San Ramon, California
  8. 2.7 8 km SE of Livermore, California
  9. 1.9 7 km SE of Livermore, California
  10. 1.6 2 km ENE of Alameda, California
  11. 1.7 2 km E of Berkeley, California
  12. 1.5 2 km ESE of Berkeley, California
  13. 1.6 1 km NNW of Crockett, California
  14. 2.0 8 km NNE of East Foothills, California
  15. 1.8 Northern 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.