QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

2km ENE of Hayward, CA

· 6.6 km deep · released about 230 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 12 kmContra Costa County 31 kmSan Mateo County 38 kmSanta Clara County 57 kmSolano County 69 kmSanta Cruz County 71 kmMarin County 75 kmSan Joaquin 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 2.6 (md)
Depth
6.6 km below the surface
Felt
139 reports · strongest reported intensity IV
Nearest
Alameda County, 12 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1775 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 139 people have reported feeling it to USGS.

How big was it?

This earthquake released about 230 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 65,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 46,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.1× the energy of this one
  4. This earthquake M 2.6 about 230 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 37.6500, -122.0540. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 12 km (8 mi) W of here earthquakes near Alameda County
Contra Costa County, CA 31 km (19 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 (36 mi) NW of here earthquakes near Santa Clara County
Solano County, CA 69 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

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

  1. 2.4 11km NE of Milpitas, CA
  2. 1.7 8km SSW of Livermore, CA
  3. 1.8 3km SW of Alamo, CA
  4. 1.9 3km SW of Clayton, CA
  5. 1.8 2km NW of Pacifica, CA
  6. 1.6 4km SW of Colma, CA
  7. 1.8 1km ENE of Alamo, CA
  8. 1.7 5km WNW of Dublin, CA
  9. 1.5 5km E of Fremont, CA
  10. 1.6 1km NE of Berkeley, CA
  11. 2.1 8km ENE of Alum Rock, CA
  12. 2.0 1km NNW of Pleasant Hill, CA
  13. 2.1 15km ENE of Alum Rock, CA
  14. 2.4 5km SE of Portola Valley, CA
  15. 2.2 2km E of Saratoga, 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 4.5 on 2019-10-15 — it released about 640 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.