QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

10 km WNW of Bridgeport, CA

· 10 km deep · released about 860 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alpine County 55 kmMono County 58 kmTuolumne County 61 kmDouglas County 73 kmLyon County 84 kmMineral County 85 kmMariposa County 93 kmCarson City 103 kmCalaveras County 106 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 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Alpine County, 55 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 969 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 860 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 6.7 390,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 18,000× 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 860 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 38.2775, -119.3457. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alpine County, CA 55 km (34 mi) SE of here earthquakes near Alpine County
Mono County, CA 58 km (36 mi) NW of here earthquakes near Mono County
Tuolumne County, CA 61 km (38 mi) ENE of here earthquakes near Tuolumne County
Douglas County, NV 73 km (46 mi) SSE of here earthquakes near Douglas County
Lyon County, NV 84 km (52 mi) S of here earthquakes near Lyon County
Mineral County, NV 85 km (53 mi) WSW of here earthquakes near Mineral County

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

Aftershocks so far

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

  1. 2.5 6 km NW of Walker, CA
  2. 1.5 33 km SSW of Hawthorne, Nevada
  3. 1.5 3 km WSW of Coleville, California
  4. 2.1 32 km SSW of Hawthorne, Nevada
  5. 2.7 6 km NNW of Walker, CA
  6. 3.3 34 km SSW of Hawthorne, Nevada
  7. 1.8 33 km SSW of Hawthorne, Nevada
  8. 1.7 34 km SSW of Hawthorne, Nevada
  9. 1.9 33 km SSW of Hawthorne, Nevada
  10. 1.6 13 km E of Topaz, California
  11. 2.9 5 km WNW of Walker, CA
  12. 2.5 5 km NNW of Walker, CA
  13. 1.5 17 km SSE of Walker, California
  14. 2.8 3 km W of Walker, CA
  15. 1.6 29 km SW of Hawthorne, Nevada

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 35,000 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.