QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

10 km WSW of Patterson, CA

· 4.8 km deep · released about 890 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Stanislaus County 25 kmSanta Clara County 47 kmMerced County 54 kmSan Joaquin County 54 kmAlameda County 63 kmContra Costa County 81 kmSanta Cruz County 83 kmSan Benito County 94 kmSan Mateo County 100 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 3.0 (ml)
Depth
4.8 km below the surface
Felt
26 reports · strongest reported intensity IV
Nearest
Stanislaus County, 25 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1029 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 26 people have reported feeling it to USGS.

How big was it?

This earthquake released about 890 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 380,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 17,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 12,000× the energy of this one
  4. This earthquake M 3.0 about 890 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 37.4477, -121.2435. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Stanislaus County, CA 25 km (15 mi) WSW of here earthquakes near Stanislaus County
Santa Clara County, CA 47 km (29 mi) ENE of here earthquakes near Santa Clara County
Merced County, CA 54 km (34 mi) WNW of here earthquakes near Merced County
San Joaquin County, CA 54 km (34 mi) S of here earthquakes near San Joaquin County
Alameda County, CA 63 km (39 mi) ESE of here earthquakes near Alameda County
Contra Costa County, CA 81 km (51 mi) SE of here earthquakes near Contra Costa 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 9 km NE of Alum Rock, CA
  2. 1.7 24 km W of Los Banos, CA
  3. 1.5 11 km WSW of Patterson, CA
  4. 2.7 15 km SW of Westley, CA
  5. 2.5 24 km SSW of Gustine, CA
  6. 2.5 24 km SSW of Gustine, CA
  7. 1.7 25 km NE of Hollister, CA
  8. 1.6 15 km N of Morgan Hill, CA
  9. 1.7 20 km WSW of Patterson, CA
  10. 1.6 24 km SW of Gustine, CA
  11. 1.7 9 km ENE of Morgan Hill, CA
  12. 2.4 23 km W of Los Banos, CA
  13. 1.6 25 km NE of Hollister, CA
  14. 1.7 25 km NE of Hollister, CA
  15. 2.2 25 km NE of Hollister, 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 1,300 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.