QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

8km SE of Sunol, CA

· 3.9 km deep · released about 230 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 13 kmSanta Clara County 38 kmContra Costa County 43 kmSan Mateo County 49 kmSanta Cruz County 61 kmSan Joaquin County 66 kmStanislaus County 74 kmSolano County 81 kmMarin County 98 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
3.9 km below the surface
Felt
19 reports · strongest reported intensity III
Nearest
Alameda County, 13 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2854 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 19 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 37.5425, -121.8382. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 13 km (8 mi) SSE of here earthquakes near Alameda County
Santa Clara County, CA 38 km (24 mi) NNW of here earthquakes near Santa Clara County
Contra Costa County, CA 43 km (27 mi) SSE of here earthquakes near Contra Costa County
San Mateo County, CA 49 km (31 mi) ENE of here earthquakes near San Mateo County
Santa Cruz County, CA 61 km (38 mi) NNE of here earthquakes near Santa Cruz County
San Joaquin County, CA 66 km (41 mi) SW of here earthquakes near San Joaquin 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. 2.5 12km NNE of Morgan Hill, CA
  2. 2.7 3km NNE of San Ramon, CA
  3. 2.8 3km NE of Oakland, CA
  4. 2.4 17km ESE of Livermore, CA
  5. 1.8 8km SSE of Portola Valley, CA
  6. 2.1 3km SW of Monte Sereno, CA
  7. 1.5 3km ESE of Berkeley, CA
  8. 2.0 11km NNE of Alum Rock, CA
  9. 1.8 12km SSW of Mountain House, CA
  10. 1.7 12km SSW of Mountain House, CA
  11. 1.6 14km ESE of Livermore, CA
  12. 2.0 10km ENE of Blackhawk, CA
  13. 1.9 10km ENE of Blackhawk, CA
  14. 2.2 10km ENE of Blackhawk, CA
  15. 1.9 10km E of Alum Rock, 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 4.1 on 2017-10-10 — it released about 180 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.