QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

6km SE of Bridgeport, CA

Yes. A magnitude 1.9 earthquake was recorded 6km SE of Bridgeport, CA, at 5:08 pm PST on 18 December 2022 (01:08 UTC), 8.4 km deep.

· 8.4 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mono County 43 kmAlpine County 70 kmTuolumne County 72 kmMineral County 75 kmDouglas County 85 kmLyon County 89 kmMariposa County 96 kmCarson City 115 kmCalaveras County 120 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 1.9 (md)
Depth
8.4 km below the surface
Felt
no reports yet
Nearest
Mono County, 43 km SE
Nearest mapped fault
Robinson Creek fault, 11 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1417 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 12 km (7 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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.

For this area

The largest earthquake within 50 km since 2016 was M 6.0 on 2021-07-08 — about 1,400,000 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

  1. 5.8 3 km NE of Mono City, California · 18 km SSE of this epicentre
  2. 5.2 23 km S of Walker, California · 29 km WNW of this epicentre
  3. 5.2 21 km S of Hawthorne, Nevada · 47 km ENE of this epicentre
  4. 5.2 31 km ENE of Mono City, California · 33 km ESE of this epicentre
  5. 5.1 23 km E of Bridgeport, California · 20 km ENE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 38.2188, -119.1852. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Mono County, CA 43 km (27 mi) SE earthquakes near Mono County
Alpine County, CA 70 km (43 mi) NW earthquakes near Alpine County
Tuolumne County, CA 72 km (45 mi) WSW earthquakes near Tuolumne County
Mineral County, NV 75 km (46 mi) ENE earthquakes near Mineral County
Douglas County, NV 85 km (53 mi) NNW earthquakes near Douglas County
Lyon County, NV 89 km (56 mi) N earthquakes near Lyon County

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

Aftershocks so far

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

  1. 2.4 5km W of Walker, CA
  2. 1.7 14km NNE of Lee Vining, CA
  3. 2.5 27km SE of Bodie, CA
  4. 2.0 29km SE of Bodie, CA
  5. 1.5 12 km ENE of Bridgeport, California
  6. 2.3 13km SW of Walker, CA
  7. 2.8 28 km WSW of Hawthorne, Nevada
  8. 1.5 24 km E of Mono City, California
  9. 1.8 27 km WSW of Hawthorne, Nevada
  10. 1.5 5 km SW of Coleville, California
  11. 2.0 24km SE of Bodie, CA
  12. 1.5 37km SE of Bodie, CA
  13. 2.2 7km WNW of Walker, CA
  14. 2.3 5km WNW of Walker, CA
  15. 2.1 5km WNW of Walker, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.