QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

2 km SSE of Livermore, California

· 5.8 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 13 kmContra Costa County 33 kmSanta Clara County 50 kmSan Joaquin County 52 kmSan Mateo County 61 kmStanislaus County 68 kmSolano County 69 kmSanta Cruz County 76 kmSacramento County 95 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 2.1 (md)
Depth
5.8 km below the surface
Felt
15 reports · strongest reported intensity III
Nearest
Alameda County, 13 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3404 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 15 people have reported feeling it to USGS.

How big was it?

This earthquake released about 38 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 37.6643, -121.7613. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 13 km (8 mi) E of here earthquakes near Alameda County
Contra Costa County, CA 33 km (20 mi) SSE of here earthquakes near Contra Costa County
Santa Clara County, CA 50 km (31 mi) N of here earthquakes near Santa Clara County
San Joaquin County, CA 52 km (33 mi) SW of here earthquakes near San Joaquin County
San Mateo County, CA 61 km (38 mi) ENE of here earthquakes near San Mateo County
Stanislaus County, CA 68 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

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

  1. 2.1 4 km E of Union City, California
  2. 2.5 4 km N of East Foothills, California
  3. 1.9 Northern California
  4. 1.8 2 km NNE of North Gate, California
  5. 1.6 0 km ENE of North Gate, California
  6. 2.5 1 km N of Pleasant Hill, California
  7. 1.8 1 km NNW of Pleasant Hill, California
  8. 2.3 6 km E of East Foothills, California
  9. 1.7 4 km NNW of Orinda, California
  10. 2.6 2 km ESE of Berkeley, California
  11. 1.9 4 km NNW of Orinda, California
  12. 1.5 Northern California
  13. 1.9 9 km NNE of East Foothills, California
  14. 1.6 4 km SE of Piedmont, California
  15. 1.5 2 km S of Loyola, 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.