QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

18km W of Bridgeport, CA

· 6.3 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alpine County 52 kmTuolumne County 53 kmMono County 62 kmDouglas County 74 kmMariposa County 86 kmLyon County 88 kmMineral County 94 kmCalaveras County 98 kmCarson City 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 1.8 (md)
Depth
6.3 km below the surface
Felt
no reports yet
Nearest
Alpine County, 52 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3127 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 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 38.2525, -119.4362. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alpine County, CA 52 km (32 mi) SE of here earthquakes near Alpine County
Tuolumne County, CA 53 km (33 mi) ENE of here earthquakes near Tuolumne County
Mono County, CA 62 km (38 mi) NW of here earthquakes near Mono County
Douglas County, NV 74 km (46 mi) SSE of here earthquakes near Douglas County
Mariposa County, CA 86 km (54 mi) NNE of here earthquakes near Mariposa County
Lyon County, NV 88 km (55 mi) SSW of here earthquakes near Lyon County

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

Aftershocks so far

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

  1. 1.6 29 km WSW of Hawthorne, Nevada
  2. 1.6 28 km WSW of Hawthorne, Nevada
  3. 2.1 3km W of Bridgeport, CA
  4. 1.5 19 km E of Walker, California
  5. 1.6 17km ENE of Lee Vining, CA
  6. 1.6 28 km SW of Hawthorne, Nevada
  7. 1.5 30 km SW of Hawthorne, Nevada
  8. 2.4 28 km WSW of Hawthorne, Nevada
  9. 1.6 17km S of Bridgeport, CA
  10. 2.2 6km WNW of Bridgeport, CA
  11. 2.5 6km WNW of Bridgeport, CA
  12. 1.7 19 km E of Walker, California
  13. 2.0 28 km WSW of Hawthorne, Nevada
  14. 1.5 California-Nevada border region
  15. 1.5 12 km SSW 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 480,000 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.