QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

6km N of San Leandro, CA

· 9.0 km deep · released about 8.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 23 kmAlameda County 26 kmSan Mateo County 45 kmSolano County 57 kmMarin County 60 kmSanta Clara County 74 kmSan Francisco County 78 kmSan Joaquin County 79 kmNapa 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, 23 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1782 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 8.1 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 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 8.1 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 37.7803, -122.1520. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 23 km (15 mi) SW of here earthquakes near Contra Costa County
Alameda County, CA 26 km (16 mi) NW of here earthquakes near Alameda County
San Mateo County, CA 45 km (28 mi) NNE of here earthquakes near San Mateo County
Solano County, CA 57 km (36 mi) SSW of here earthquakes near Solano County
Marin County, CA 60 km (37 mi) ESE of here earthquakes near Marin County
Santa Clara County, CA 74 km (46 mi) NNW 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

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

  1. 1.5 4km WSW of Colma, CA
  2. 1.7 5km WSW of Pacheco, CA
  3. 1.5 2km NE of Union City, CA
  4. 1.7 11km NE of Milpitas, CA
  5. 2.6 2km SW of Colma, CA
  6. 1.5 10km ENE of Milpitas, CA
  7. 1.5 2km S of Alamo, CA
  8. 2.3 4km NE of Fairview, CA
  9. 1.6 2km NE of San Ramon, CA
  10. 1.9 1km NW of Danville, CA
  11. 1.7 1km WNW of Danville, CA
  12. 2.0 1km N of Pacifica, CA
  13. 1.6 6km E of Vallejo, CA
  14. 1.6 3km SSW of Half Moon Bay, CA
  15. 2.3 2km SW of Discovery Bay, 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 18,000 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.