QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

2km ENE of San Leandro, CA

· 4.5 km deep · released about 190 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 22 kmContra Costa County 27 kmSan Mateo County 41 kmSolano County 62 kmMarin County 64 kmSanta Clara County 69 kmSan Francisco County 79 kmSan Joaquin County 79 kmSanta Cruz County 81 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 2.5 (md)
Depth
4.5 km below the surface
Felt
210 reports · strongest reported intensity III
Nearest
Alameda County, 22 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1821 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 210 people have reported feeling it to USGS.

How big was it?

This earthquake released about 190 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 78,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 55,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.9× the energy of this one
  4. This earthquake M 2.5 about 190 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 37.7307, -122.1360. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 22 km (14 mi) WNW of here earthquakes near Alameda County
Contra Costa County, CA 27 km (16 mi) SW of here earthquakes near Contra Costa County
San Mateo County, CA 41 km (25 mi) NNE of here earthquakes near San Mateo County
Solano County, CA 62 km (39 mi) SSW of here earthquakes near Solano County
Marin County, CA 64 km (40 mi) ESE of here earthquakes near Marin County
Santa Clara County, CA 69 km (43 mi) NW of here earthquakes near Santa Clara 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. 1.5 3km NNE of Vine Hill, CA
  3. 1.8 10km ESE of Livermore, CA
  4. 2.1 9km ENE of Milpitas, CA
  5. 3.3 7km S of Muir Beach, CA
  6. 2.6 0km E of San Pablo, CA
  7. 2.0 14km SE of Livermore, CA
  8. 2.1 2km SSW of Los Altos Hills, CA
  9. 2.8 3km S of Los Altos Hills, CA
  10. 1.8 2km S of Los Altos Hills, CA
  11. 2.6 1km WNW of Bay Point, CA
  12. 1.9 2km NNE of San Leandro, CA
  13. 1.6 2km NW of Bay Point, CA
  14. 1.7 2km E of Berkeley, CA
  15. 1.8 2km SE of Pacheco, 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 760 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.