QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

22km NE of Alum Rock, CA

· 5.4 km deep · released about 7.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Clara County 30 kmAlameda County 31 kmStanislaus County 56 kmContra Costa County 56 kmSan Joaquin County 59 kmSanta Cruz County 62 kmSan Mateo County 66 kmMerced County 86 kmSolano County 91 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
5.4 km below the surface
Felt
no reports yet
Nearest
Santa Clara County, 30 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2714 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 7.1 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 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.1 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 37.4838, -121.6273. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Clara County, CA 30 km (18 mi) N of here earthquakes near Santa Clara County
Alameda County, CA 31 km (19 mi) SE of here earthquakes near Alameda County
Stanislaus County, CA 56 km (35 mi) W of here earthquakes near Stanislaus County
Contra Costa County, CA 56 km (35 mi) SSE of here earthquakes near Contra Costa County
San Joaquin County, CA 59 km (37 mi) SSW of here earthquakes near San Joaquin County
Santa Cruz County, CA 62 km (39 mi) NNE of here earthquakes near Santa Cruz County

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

Aftershocks so far

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

  1. 1.9 12km ENE of Milpitas, CA
  2. 2.5 8km NE of Alum Rock, CA
  3. 1.6 9km NE of Milpitas, CA
  4. 2.5 4km SW of Saratoga, CA
  5. 2.0 4km SW of Saratoga, CA
  6. 2.4 11km NE of Milpitas, CA
  7. 2.5 10km E of Alum Rock, CA
  8. 1.8 2km NE of San Ramon, CA
  9. 1.8 2km NE of San Ramon, CA
  10. 2.6 14km N of Morgan Hill, CA
  11. 1.7 31km SW of Westley, CA
  12. 1.9 7km E of Alum Rock, CA
  13. 2.7 20km E of Alum Rock, CA
  14. 2.4 15km NE of Alum Rock, CA
  15. 1.5 2km WSW of Los Altos Hills, 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 4.1 on 2017-10-10 — it released about 5,800 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.