QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

3km E of Oakland, CA

· 9.0 km deep · released about 8.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 25 kmAlameda County 30 kmSan Mateo County 45 kmMarin County 56 kmSolano County 57 kmSan Francisco County 74 kmSanta Clara County 78 kmNapa County 80 kmSan Joaquin County 82 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 1.6 (md)
Depth
9.0 km below the surface
Felt
no reports yet
Nearest
Contra Costa County, 25 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1547 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 8.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 8.7 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 37.7955, -122.1937. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 25 km (16 mi) WSW of here earthquakes near Contra Costa County
Alameda County, CA 30 km (18 mi) NW of here earthquakes near Alameda County
San Mateo County, CA 45 km (28 mi) NNE of here earthquakes near San Mateo County
Marin County, CA 56 km (35 mi) ESE of here earthquakes near Marin County
Solano County, CA 57 km (35 mi) SSW of here earthquakes near Solano County
San Francisco County, CA 74 km (46 mi) E of here earthquakes near San Francisco County

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

Aftershocks so far

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

  1. 2.1 2km NNE of San Leandro, CA
  2. 1.7 4km WNW of Dublin, CA
  3. 2.6 4km WSW of Colma, CA
  4. 1.5 7km E of Santa Venetia, CA
  5. 1.6 11km NE of Milpitas, CA
  6. 2.2 10km SE of Sunol, CA
  7. 2.1 10km ESE of Fremont, CA
  8. 1.8 2km WNW of Los Altos Hills, CA
  9. 2.1 6km NW of Bay Point, CA
  10. 2.2 4km W of San Francisco Zoo, CA
  11. 1.9 2km ENE of Berkeley, CA
  12. 1.6 6km SSW of Suisun City, CA
  13. 1.8 2km SE of Pacheco, CA
  14. 1.7 3km ESE of Berkeley, CA
  15. 2.0 3km ESE of Berkeley, 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 17,000 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.