QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

20km SE of Livermore, CA

· 1.4 km deep · released about 160 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 29 kmSanta Clara County 41 kmSan Joaquin County 49 kmContra Costa County 50 kmStanislaus County 52 kmSan Mateo County 71 kmSanta Cruz County 73 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
1.4 km below the surface
Felt
8 reports · strongest reported intensity IV
Nearest
Alameda County, 29 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1857 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 8 people have reported feeling it to USGS.

How big was it?

This earthquake released about 160 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 95,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 68,000× the energy of this one
  3. Around the size people start to feel M 3.0 6× the energy of this one
  4. This earthquake M 2.5 about 160 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 37.5773, -121.5897. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 29 km (18 mi) ESE of here earthquakes near Alameda County
Santa Clara County, CA 41 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

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

  1. 1.8 5km WNW of Dublin, CA
  2. 1.9 4km SW of Newark, CA
  3. 2.5 9km ENE of Milpitas, CA
  4. 1.7 5km NW of Dublin, CA
  5. 1.5 3km NNW of Union City, CA
  6. 1.6 5km NW of Dublin, CA
  7. 2.4 9km ESE of Fremont, CA
  8. 1.5 6km WNW of Dublin, CA
  9. 3.1 6km WNW of Dublin, CA
  10. 2.3 8km ESE of Fremont, CA
  11. 2.9 10km NE of Milpitas, CA
  12. 1.8 1km NW of Diablo, CA
  13. 1.7 6km WNW of Dublin, CA
  14. 1.9 10km NE of Milpitas, CA
  15. 2.0 14km N of Morgan Hill, 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 4.3 on 2019-07-16 — it released about 560 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.