QuakeIndex

Earthquake · automatic estimate, may change

M 2.5md

29 km SW of Westley, CA

· 2.4 km deep · released about 160 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Clara County 28 kmStanislaus County 45 kmAlameda County 49 kmSan Joaquin County 62 kmSanta Cruz County 64 kmMerced County 69 kmContra Costa County 72 kmSan Mateo County 80 kmSan Benito County 93 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
2.4 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Santa Clara County, 28 km SW
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 255 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 160 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 95,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 68,000× the energy of this one
  3. Around the size people start to feel M 3.0 6× the energy of this one
  4. This earthquake M 2.5 about 160 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 37.3958, -121.4618. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Clara County, CA 28 km (17 mi) NE of here earthquakes near Santa Clara County
Stanislaus County, CA 45 km (28 mi) WSW of here earthquakes near Stanislaus County
Alameda County, CA 49 km (30 mi) SE of here earthquakes near Alameda County
San Joaquin County, CA 62 km (39 mi) SSW of here earthquakes near San Joaquin County
Santa Cruz County, CA 64 km (40 mi) NE of here earthquakes near Santa Cruz County
Merced County, CA 69 km (43 mi) WNW of here earthquakes near Merced County

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

Aftershocks so far

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

  1. 4.0 8 km E of Gilroy, CA
  2. 2.1 6 km N of Corralitos, CA
  3. 1.7 6 km NNE of Corralitos, CA
  4. 1.6 16 km N of Morgan Hill, CA
  5. 1.8 16 km N of Morgan Hill, CA
  6. 2.0 8 km E of Gilroy, CA
  7. 1.6 8 km E of Gilroy, CA
  8. 1.6 26 km NE of Morgan Hill, CA
  9. 2.1 6 km E of Alum Rock, CA
  10. 3.0 16 km E of Seven Trees, CA
  11. 1.7 11 km E of Alum Rock, CA
  12. 2.0 8 km E of Alum Rock, CA
  13. 1.9 6 km SW of Gilroy, CA
  14. 2.2 9 km NE of San Martin, 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 7,400 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.