QuakeIndex

Earthquake · automatic estimate, may change

M 2.5md

14 km WSW of Patterson, CA

· 3.6 km deep · released about 190 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Stanislaus County 29 kmSanta Clara County 43 kmMerced County 56 kmSan Joaquin County 56 kmAlameda County 61 kmSanta Cruz County 79 kmContra Costa County 80 kmSan Benito County 93 kmSan Mateo County 96 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
3.6 km below the surface
Felt
5 reports · strongest reported intensity IV
Nearest
Stanislaus County, 29 km ENE
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 269 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 190 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 80,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 57,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.1× the energy of this one
  4. This earthquake M 2.5 about 190 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 37.4298, -121.2808. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Stanislaus County, CA 29 km (18 mi) WSW of here earthquakes near Stanislaus County
Santa Clara County, CA 43 km (27 mi) ENE of here earthquakes near Santa Clara County
Merced County, CA 56 km (35 mi) WNW of here earthquakes near Merced County
San Joaquin County, CA 56 km (35 mi) S of here earthquakes near San Joaquin County
Alameda County, CA 61 km (38 mi) ESE of here earthquakes near Alameda County
Santa Cruz County, CA 79 km (49 mi) NE 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

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

  1. 1.6 20 km WSW of Patterson, CA
  2. 2.2 9 km E of Alum Rock, CA
  3. 1.8 9 km E of Alum Rock, CA
  4. 1.9 9 km E of Alum Rock, CA
  5. 2.7 2 km ESE of San Martin, CA
  6. 1.7 12 km ESE of Livermore, CA
  7. 2.3 5 km NNE of Alum Rock, CA
  8. 2.1 8 km NE of Alum Rock, CA
  9. 1.9 28 km WSW of Westley, CA
  10. 2.0 8 km ENE of Gilroy, CA
  11. 2.4 23 km ENE of Alum Rock, CA
  12. 1.9 9 km E of Alum Rock, CA
  13. 1.7 7 km SSW of Livermore, CA
  14. 1.8 23 km ENE of Alum Rock, CA
  15. 3.0 23 km ENE of Alum Rock, 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 6,200 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.