QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

7km S of Livermore, CA

· 3.2 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 14 kmContra Costa County 37 kmSanta Clara County 45 kmSan Joaquin County 55 kmSan Mateo County 59 kmStanislaus County 67 kmSanta Cruz County 71 kmSolano County 73 kmMarin County 99 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
3.2 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Alameda County, 14 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1852 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 19 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 5.8 790,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 560,000× the energy of this one
  3. Around the size people start to feel M 3.0 50× the energy of this one
  4. This earthquake M 1.9 about 19 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 37.6225, -121.7617. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 14 km (8 mi) ESE of here earthquakes near Alameda County
Contra Costa County, CA 37 km (23 mi) SSE of here earthquakes near Contra Costa County
Santa Clara County, CA 45 km (28 mi) N of here earthquakes near Santa Clara County
San Joaquin County, CA 55 km (34 mi) SW of here earthquakes near San Joaquin County
San Mateo County, CA 59 km (36 mi) ENE of here earthquakes near San Mateo County
Stanislaus County, CA 67 km (42 mi) W of here earthquakes near Stanislaus County

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

Aftershocks so far

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

  1. 1.8 9km ENE of Milpitas, CA
  2. 1.8 10km ESE of Livermore, CA
  3. 2.1 9km ENE of Milpitas, CA
  4. 2.0 14km SE of Livermore, CA
  5. 2.1 2km SSW of Los Altos Hills, CA
  6. 2.8 3km S of Los Altos Hills, CA
  7. 1.8 2km S of Los Altos Hills, CA
  8. 2.6 1km WNW of Bay Point, CA
  9. 2.6 16km E of Seven Trees, CA
  10. 1.9 2km NNE of San Leandro, CA
  11. 1.5 8km ENE of Alum Rock, CA
  12. 1.8 2km SE of Pacheco, CA
  13. 1.6 3km ESE of Pacheco, CA
  14. 1.6 9km NE of Milpitas, CA
  15. 2.1 4km ESE of Hayward, 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 7,700 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.