QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

13km WSW of Bridgeport, CA

· 11 km deep · released about 1,800 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tuolumne County 56 kmMono County 56 kmAlpine County 57 kmDouglas County 78 kmMariposa County 87 kmLyon County 90 kmMineral County 90 kmCalaveras County 103 kmCarson City 108 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
11 km below the surface
Felt
8 reports · strongest reported intensity III
Nearest
Tuolumne County, 56 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1821 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 8 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,800 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 6.7 190,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 8,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,000× the energy of this one
  4. This earthquake M 3.2 about 1,800 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.9× 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 38.2298, -119.3795. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tuolumne County, CA 56 km (35 mi) ENE of here earthquakes near Tuolumne County
Mono County, CA 56 km (35 mi) NW of here earthquakes near Mono County
Alpine County, CA 57 km (35 mi) SE of here earthquakes near Alpine County
Douglas County, NV 78 km (48 mi) SSE of here earthquakes near Douglas County
Mariposa County, CA 87 km (54 mi) NNE of here earthquakes near Mariposa County
Lyon County, NV 90 km (56 mi) S of here earthquakes near Lyon County

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

Aftershocks so far

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

  1. 2.2 28km S of Smith Valley, NV
  2. 1.5 32km SE of Markleeville, CA
  3. 2.4 26km ENE of Dardanelle, CA
  4. 2.3 30km SSW of Smith Valley, NV
  5. 2.1 25km ENE of Dardanelle, CA
  6. 1.6 25km ENE of Dardanelle, CA
  7. 2.5 25km ENE of Dardanelle, CA
  8. 2.7 32km SSW of Smith Valley, NV
  9. 1.8 30km SE of Markleeville, CA
  10. 1.8 25km ENE of Dardanelle, CA
  11. 2.3 25km ENE of Dardanelle, CA
  12. 1.6 25km ENE of Dardanelle, CA
  13. 1.6 25km ENE of Dardanelle, CA
  14. 1.6 25km ENE of Dardanelle, CA
  15. 1.6 25km ENE of Dardanelle, 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 6.0 on 2021-07-08 — it released about 17,000 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.