QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

13 km WNW of Bridgeport, CA

· 5.8 km deep · released about 330 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alpine County 51 kmTuolumne County 61 kmMono County 61 kmDouglas County 70 kmLyon County 81 kmMineral County 86 kmMariposa County 94 kmCarson City 100 kmCalaveras County 104 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 2.7 (md)
Depth
5.8 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Alpine County, 51 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1023 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 330 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 46,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 33,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.9× the energy of this one
  4. This earthquake M 2.7 about 330 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, -119.3678. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alpine County, CA 51 km (32 mi) SE of here earthquakes near Alpine County
Tuolumne County, CA 61 km (38 mi) ENE of here earthquakes near Tuolumne County
Mono County, CA 61 km (38 mi) NW of here earthquakes near Mono County
Douglas County, NV 70 km (43 mi) SSE of here earthquakes near Douglas County
Lyon County, NV 81 km (50 mi) S of here earthquakes near Lyon County
Mineral County, NV 86 km (54 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

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

  1. 2.0 6 km SW of Walker, CA
  2. 1.5 3 km SW of Coleville, California
  3. 1.6 0 km WSW of Coleville, California
  4. 1.5 4 km SW of Topaz, California
  5. 1.5 2 km NW of Walker, California
  6. 1.7 1 km NNW of Walker, California
  7. 1.7 2 km WSW of Walker, California
  8. 1.5 4 km WSW of Walker, California
  9. 1.6 28 km SW of Hawthorne, Nevada
  10. 2.8 15 km SSW of Walker, CA
  11. 1.7 3 km SSW of Coleville, California
  12. 1.5 2 km SW of Walker, California
  13. 1.6 7 km SE of Markleeville, California
  14. 2.2 5 km N of Walker, CA
  15. 1.5 6 km WSW of Walker, 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 6.0 on 2021-07-08 — it released about 92,000 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.