QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

25 km SE of Livermore, California

· -0.4 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 34 kmSanta Clara County 36 kmStanislaus County 49 kmSan Joaquin County 52 kmContra Costa County 56 kmSanta Cruz County 70 kmSan Mateo County 73 kmMerced County 83 kmSolano County 89 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 1.7 (md)
Depth
-0.4 km below the surface
Felt
no reports yet
Nearest
Alameda County, 34 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3516 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 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 95× the energy of this one
  4. This earthquake M 1.7 about 10 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 37.5277, -121.5598. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 34 km (21 mi) ESE of here earthquakes near Alameda County
Santa Clara County, CA 36 km (22 mi) NNE of here earthquakes near Santa Clara County
Stanislaus County, CA 49 km (31 mi) W of here earthquakes near Stanislaus County
San Joaquin County, CA 52 km (32 mi) SSW of here earthquakes near San Joaquin County
Contra Costa County, CA 56 km (35 mi) SE of here earthquakes near Contra Costa County
Santa Cruz County, CA 70 km (43 mi) NE of here earthquakes near Santa Cruz County

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

Aftershocks so far

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

  1. 2.0 7 km E of East Foothills, California
  2. 1.9 11 km SW of Brentwood, California
  3. 3.8 8 km E of Blackhawk, California
  4. 2.4 16 km N of Morgan Hill, California
  5. 1.5 5 km ESE of Fremont, California
  6. 2.9 16 km E of Seven Trees, California
  7. 2.3 9 km ENE of Blackhawk, California
  8. 1.9 1 km W of Diablo, California
  9. 1.6 1 km W of Diablo, California
  10. 2.8 Northern California
  11. 1.6 6 km NE of East Foothills, California
  12. 2.0 7 km E of East Foothills, California
  13. 1.7 9 km ESE of East Foothills, California
  14. 1.8 14 km E of Seven Trees, California
  15. 1.8 10 km NNE of East Foothills, California

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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.