QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

15 km WNW of Bridgeport, CA

· 3.1 km deep · released about 98 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alpine County 50 kmTuolumne County 59 kmMono County 63 kmDouglas County 69 kmLyon County 82 kmMineral County 88 kmMariposa County 93 kmCarson City 99 kmCalaveras County 102 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 2.3 (md)
Depth
3.1 km below the surface
Felt
no reports yet
Nearest
Alpine County, 50 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 149 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 98 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 150,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 110,000× the energy of this one
  3. Around the size people start to feel M 3.0 9.8× the energy of this one
  4. This earthquake M 2.3 about 98 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 38.3047, -119.3925. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alpine County, CA 50 km (31 mi) SE of here earthquakes near Alpine County
Tuolumne County, CA 59 km (37 mi) ENE of here earthquakes near Tuolumne County
Mono County, CA 63 km (39 mi) NW of here earthquakes near Mono County
Douglas County, NV 69 km (43 mi) SSE of here earthquakes near Douglas County
Lyon County, NV 82 km (51 mi) SSW of here earthquakes near Lyon County
Mineral County, NV 88 km (55 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

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

  1. 1.6 13 km SE of Markleeville, CA
  2. 2.0 14 km SE of Markleeville, CA
  3. 2.0 6 km SSW of Smith Valley, Nevada
  4. 2.7 3 km W of Walker, CA
  5. 1.9 15 km SE of Markleeville, CA
  6. 1.9 14 km SE of Markleeville, CA
  7. 2.3 15 km SE of Markleeville, CA
  8. 2.3 15 km ESE of Markleeville, CA
  9. 1.7 29 km SW of Hawthorne, Nevada
  10. 1.8 15 km NNE of Lee Vining, CA
  11. 2.0 16 km S of Bridgeport, CA
  12. 2.0 2 km SW of Walker, CA
  13. 1.6 30 km ENE of Bridgeport, California
  14. 2.2 18 km NE of Dardanelle, CA
  15. 1.9 20 km E of Markleeville, 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 310,000 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.