QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

11 km SSE of Livermore, CA

· 17 km deep · released about 24 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 20 kmContra Costa County 42 kmSanta Clara County 43 kmSan Joaquin County 52 kmStanislaus County 61 kmSan Mateo County 64 kmSanta Cruz County 72 kmSolano County 77 kmMerced County 97 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 1.9 (md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Alameda County, 20 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 431 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 24 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 640,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 450,000× the energy of this one
  3. Around the size people start to feel M 3.0 40× the energy of this one
  4. This earthquake M 1.9 about 24 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 37.6068, -121.6905. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 20 km (12 mi) ESE of here earthquakes near Alameda County
Contra Costa County, CA 42 km (26 mi) SSE of here earthquakes near Contra Costa County
Santa Clara County, CA 43 km (27 mi) N of here earthquakes near Santa Clara County
San Joaquin County, CA 52 km (32 mi) SW of here earthquakes near San Joaquin County
Stanislaus County, CA 61 km (38 mi) W of here earthquakes near Stanislaus County
San Mateo County, CA 64 km (40 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

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

  1. 2.1 13 km NE of Alum Rock, CA
  2. 1.9 8 km NE of Alum Rock, CA
  3. 2.7 8 km NE of Alum Rock, CA
  4. 1.6 8 km ENE of Alum Rock, CA
  5. 1.6 3 km SSW of Clayton, CA
  6. 1.8 10 km ESE of Alum Rock, CA
  7. 2.2 1 km SE of Milpitas, CA
  8. 2.1 2 km NNE of Danville, CA
  9. 1.7 11 km E of Blackhawk, CA
  10. 1.8 5 km SE of Bay Point, CA
  11. 1.6 10 km ENE of Blackhawk, CA
  12. 1.6 9 km W of Brentwood, CA
  13. 1.8 15 km E of Seven Trees, CA
  14. 1.9 3 km SW of Clayton, CA
  15. 1.9 8 km ESE of Clayton, 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 50,000 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.