QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

18km SE of Groveland-Big Oak Flat, CA

· 29 km deep · released about 180 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mariposa County 21 kmTuolumne County 35 kmMadera County 63 kmCalaveras County 67 kmMerced County 81 kmStanislaus County 83 kmAmador County 95 kmAlpine County 104 kmMono County 108 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 2.5 (md)
Depth
29 km below the surface
Felt
6 reports · strongest reported intensity II
Nearest
Mariposa County, 21 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 657 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 6 people have reported feeling it to USGS.

How big was it?

This earthquake released about 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 83,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 59,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.2× the energy of this one
  4. This earthquake M 2.5 about 180 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 37.7168, -120.0760. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mariposa County, CA 21 km (13 mi) NW of here earthquakes near Mariposa County
Tuolumne County, CA 35 km (22 mi) SSW of here earthquakes near Tuolumne County
Madera County, CA 63 km (39 mi) NNW of here earthquakes near Madera County
Calaveras County, CA 67 km (42 mi) SE of here earthquakes near Calaveras County
Merced County, CA 81 km (51 mi) NE of here earthquakes near Merced County
Stanislaus County, CA 83 km (52 mi) ENE of here earthquakes near Stanislaus County

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

Aftershocks so far

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

  1. 2.2 13km SSW of Mariposa, CA
  2. 2.3 6km S of Vallecito, CA
  3. 2.4 21km SSW of Mariposa, CA
  4. 2.1 19km SSW of Mariposa, CA
  5. 2.0 17km SSW of Bootjack, CA
  6. 2.5 18km SSW of Mariposa, CA
  7. 2.4 21km SSW of Bootjack, CA
  8. 2.5 21km ENE of Le Grand, CA
  9. 1.5 14km SSW of Mariposa, CA
  10. 2.1 11km E of Groveland-Big Oak Flat, CA
  11. 1.8 12km N of Yosemite Village, CA
  12. 1.7 12km S of Bootjack, CA
  13. 1.9 18km SSW of Bootjack, CA
  14. 2.1 21km SSW of Mariposa, CA
  15. 2.1 18km SSW of Mariposa, 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.