QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

9 km SSW of Mariposa, CA

· 21 km deep · released about 400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mariposa County 20 kmMadera County 32 kmMerced County 68 kmTuolumne County 68 kmFresno County 78 kmStanislaus County 90 kmCalaveras County 99 kmMono County 115 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 2.8 (md)
Depth
21 km below the surface
Felt
32 reports · strongest reported intensity III
Nearest
Mariposa County, 20 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 295 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 32 people have reported feeling it to USGS.

How big was it?

This earthquake released about 400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 38,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 27,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.4× the energy of this one
  4. This earthquake M 2.8 about 400 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 37.4080, -120.0072. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mariposa County, CA 20 km (13 mi) SSW of here earthquakes near Mariposa County
Madera County, CA 32 km (20 mi) NW of here earthquakes near Madera County
Merced County, CA 68 km (42 mi) ENE of here earthquakes near Merced County
Tuolumne County, CA 68 km (42 mi) S of here earthquakes near Tuolumne County
Fresno County, CA 78 km (49 mi) NNW of here earthquakes near Fresno County
Stanislaus County, CA 90 km (56 mi) E of here earthquakes near Stanislaus County

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

Aftershocks so far

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

  1. 1.7 7 km E of Yosemite Lakes, CA
  2. 1.8 11 km S of Yosemite Lakes, CA
  3. 1.7 7 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  4. 1.8 14 km SSW of Bootjack, CA
  5. 1.9 8 km ESE of Coarsegold, CA
  6. 2.0 8 km ESE of Coarsegold, CA
  7. 2.0 9 km ESE of Coarsegold, CA
  8. 2.0 7 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  9. 1.8 6 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  10. 1.7 8 km ESE of Coarsegold, CA
  11. 2.7 8 km NW of Yosemite Lakes, CA
  12. 2.1 11 km S of Yosemite Lakes, CA
  13. 1.9 6 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  14. 1.7 6 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  15. 2.2 17 km NW of Yosemite Lakes, 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.