QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5mw

12km NNW of Bridgeport, CA

· 3.9 km deep · released about 2.5 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alpine County 53 kmMono County 61 kmDouglas County 67 kmTuolumne County 69 kmLyon County 75 kmMineral County 79 kmCarson City 97 kmMariposa County 102 kmCalaveras County 112 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 3.5 (mw)
Depth
3.9 km below the surface
Felt
no reports yet
Measured shaking
intensity V (ShakeMap)
Nearest
Alpine County, 53 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2273 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 2.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 68,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,100× the energy of this one
  4. This earthquake M 3.5 about 2.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 5.2× 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 38.3540, -119.2933. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alpine County, CA 53 km (33 mi) SE of here earthquakes near Alpine County
Mono County, CA 61 km (38 mi) NW of here earthquakes near Mono County
Douglas County, NV 67 km (42 mi) SSE of here earthquakes near Douglas County
Tuolumne County, CA 69 km (43 mi) ENE of here earthquakes near Tuolumne County
Lyon County, NV 75 km (46 mi) S of here earthquakes near Lyon County
Mineral County, NV 79 km (49 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

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

  1. 2.5 22km N of Bridgeport, CA
  2. 2.0 4km SW of Bridgeport, CA
  3. 1.8 14km SSW of Bridgeport, CA
  4. 2.3 26 km WSW of Hawthorne, Nevada
  5. 2.2 26 km WSW of Hawthorne, Nevada
  6. 2.2 12km NNW of Bridgeport, CA
  7. 2.4 12km NW of Bridgeport, CA
  8. 1.5 14 km ENE of Mono City, California
  9. 1.5 30 km WSW of Hawthorne, Nevada
  10. 2.4 10km N of Lee Vining, CA
  11. 1.6 16km SW of Bodie, CA
  12. 1.7 27 km WSW of Hawthorne, Nevada
  13. 1.6 29 km WSW of Hawthorne, Nevada
  14. 1.8 29 km WSW of Hawthorne, Nevada
  15. 1.6 12 km NNW of Bridgeport, California

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 5.6 on 2016-12-28 — it released about 1,500 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.