QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

7 km E of Fremont, CA

· 7.4 km deep · released about 1,700 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 13 kmSanta Clara County 40 kmContra Costa County 43 kmSan Mateo County 43 kmSanta Cruz County 59 kmSan Joaquin County 71 kmStanislaus County 80 kmSolano County 82 kmMarin County 94 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 3.2 (ml)
Depth
7.4 km below the surface
Felt
1112 reports · strongest reported intensity III
Nearest
Alameda County, 13 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 178 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1112 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,700 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 200,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,500× the energy of this one
  4. This earthquake M 3.2 about 1,700 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.7× more

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 37.5338, -121.9068. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 13 km (8 mi) S of here earthquakes near Alameda County
Santa Clara County, CA 40 km (25 mi) NNW of here earthquakes near Santa Clara County
Contra Costa County, CA 43 km (27 mi) S of here earthquakes near Contra Costa County
San Mateo County, CA 43 km (27 mi) ENE of here earthquakes near San Mateo County
Santa Cruz County, CA 59 km (36 mi) N of here earthquakes near Santa Cruz County
San Joaquin County, CA 71 km (44 mi) SW of here earthquakes near San Joaquin 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. 2.0 3 km N of San Leandro, CA
  2. 2.4 3 km N of San Leandro, CA
  3. 1.6 13 km NNE of Morgan Hill, CA
  4. 1.5 14 km SSE of Livermore, CA
  5. 2.1 9 km E of Milpitas, CA
  6. 1.5 6 km ENE of Burlingame, CA
  7. 1.9 16 km E of Seven Trees, CA
  8. 2.2 16 km E of Seven Trees, CA
  9. 1.7 3 km E of Alamo, CA
  10. 1.6 7 km N of Day Valley, CA
  11. 2.8 16 km E of Seven Trees, CA
  12. 1.6 2 km N of Livermore, CA
  13. 1.5 16 km N of Morgan Hill, CA
  14. 1.7 1 km NNW of Orinda, CA
  15. 1.8 1 km NNW of Orinda, 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 5.1 on 2022-10-25 — it released about 710 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.