QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

6km S of Livermore, CA

· 3.9 km deep · released about 240 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 13 kmContra Costa County 36 kmSanta Clara County 45 kmSan Joaquin County 56 kmSan Mateo County 58 kmStanislaus County 68 kmSanta Cruz County 71 kmSolano County 73 kmMarin County 98 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 2.6 (md)
Depth
3.9 km below the surface
Felt
81 reports · strongest reported intensity III
Nearest
Alameda County, 13 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1460 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 81 people have reported feeling it to USGS.

How big was it?

This earthquake released about 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 45,000× the energy of this one
  3. Around the size people start to feel M 3.0 4× the energy of this one
  4. This earthquake M 2.6 about 240 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 37.6237, -121.7722. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 13 km (8 mi) ESE of here earthquakes near Alameda County
Contra Costa County, CA 36 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 56 km (35 mi) SW of here earthquakes near San Joaquin County
San Mateo County, CA 58 km (36 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

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

  1. 3.2 2km NE of San Ramon, CA
  2. 3.9 1km NE of San Ramon, CA
  3. 1.8 8km WSW of Mountain House, CA
  4. 2.0 5km E of Fremont, CA
  5. 1.5 11km SW of Mountain House, CA
  6. 1.6 6km N of San Leandro, CA
  7. 1.6 1km SSE of San Ramon, CA
  8. 2.0 9km SW of Brentwood, CA
  9. 2.6 8km ENE of Alum Rock, CA
  10. 1.9 22km NE of Morgan Hill, CA
  11. 1.6 1km SW of Alamo, CA
  12. 1.6 10km NE of Milpitas, CA
  13. 1.5 3km SSW of Clayton, CA
  14. 1.9 1km S of San Ramon, CA
  15. 1.6 9km SE of Sunol, 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 620 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.