QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

20 km SE of Livermore, CA

· 3.0 km deep · released about 180 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 29 kmSanta Clara County 40 kmSan Joaquin County 49 kmContra Costa County 50 kmStanislaus County 52 kmSan Mateo County 71 kmSanta Cruz County 72 kmSolano County 83 kmMerced County 88 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 2.5 (md)
Depth
3.0 km below the surface
Felt
2 reports · strongest reported intensity I
Nearest
Alameda County, 29 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 74 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 83,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 59,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.2× the energy of this one
  4. This earthquake M 2.5 about 180 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 37.5735, -121.5912. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 29 km (18 mi) ESE of here earthquakes near Alameda County
Santa Clara County, CA 40 km (25 mi) NNE of here earthquakes near Santa Clara County
San Joaquin County, CA 49 km (30 mi) SW of here earthquakes near San Joaquin County
Contra Costa County, CA 50 km (31 mi) SE of here earthquakes near Contra Costa County
Stanislaus County, CA 52 km (32 mi) W of here earthquakes near Stanislaus County
San Mateo County, CA 71 km (44 mi) ENE of here earthquakes near San Mateo County

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

Aftershocks so far

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

  1. 1.6 11 km SE of Sunol, CA
  2. 1.8 15 km E of Seven Trees, CA
  3. 1.6 1 km ENE of Hayward, CA
  4. 1.7 8 km WSW of Byron, CA
  5. 2.1 9 km ENE of Morgan Hill, CA
  6. 2.0 2 km SSW of Alamo, CA
  7. 1.8 2 km SW of Alamo, CA
  8. 2.1 15 km N of Morgan Hill, CA
  9. 2.2 8 km NE of Alum Rock, CA
  10. 2.3 14 km N of Morgan Hill, CA
  11. 1.8 2 km SW of Alamo, CA
  12. 2.0 12 km SE of Sunol, CA
  13. 2.0 2 km ENE of Hayward, CA
  14. 2.1 15 km N of Morgan Hill, CA
  15. 1.6 9 km ENE of Blackhawk, 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 5.1 on 2022-10-25 — it released about 6,500 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.