QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

2km E of Hayward, CA

· 4.8 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 12 kmContra Costa County 32 kmSan Mateo County 38 kmSanta Clara County 57 kmSolano County 70 kmSanta Cruz County 71 kmSan Joaquin County 75 kmMarin County 76 kmSan Francisco 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 1.7 (md)
Depth
4.8 km below the surface
Felt
no reports yet
Nearest
Alameda County, 12 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3133 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 37.6462, -122.0498. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 12 km (8 mi) W of here earthquakes near Alameda County
Contra Costa County, CA 32 km (20 mi) SSW of here earthquakes near Contra Costa County
San Mateo County, CA 38 km (24 mi) NE of here earthquakes near San Mateo County
Santa Clara County, CA 57 km (35 mi) NW of here earthquakes near Santa Clara County
Solano County, CA 70 km (43 mi) S of here earthquakes near Solano County
Santa Cruz County, CA 71 km (44 mi) N of here earthquakes near Santa Cruz County

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

Aftershocks so far

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

  1. 2.9 2km ENE of Danville, CA
  2. 1.6 2km ENE of Danville, CA
  3. 3.8 9km NNE of Alum Rock, CA
  4. 1.9 9km NE of Milpitas, CA
  5. 1.7 2km NW of Castro Valley, CA
  6. 2.1 4km ESE of San Ramon, CA
  7. 1.7 5km WSW of Cupertino, CA
  8. 2.8 2km E of Pacheco, CA
  9. 2.7 0km WNW of Diablo, CA
  10. 1.7 2km WSW of Diablo, CA
  11. 1.6 10km NE of Milpitas, CA
  12. 1.8 3km NNE of Fremont, CA
  13. 1.9 10km NNW of Boulder Creek, CA
  14. 2.2 1km NE of San Leandro, CA
  15. 1.6 9km SSW of Brentwood, 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 4.4 on 2018-01-04 — it released about 9,100 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.