QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

6 km ESE of Coulterville, California

· 26 km deep · released about 69 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mariposa County 23 kmTuolumne County 40 kmMadera County 63 kmCalaveras County 67 kmMerced County 75 kmStanislaus County 78 kmAmador County 95 kmSan Joaquin County 104 kmAlpine 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 2.2 (md)
Depth
26 km below the surface
Felt
no reports yet
Nearest
Mariposa County, 23 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3281 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 69 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 220,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 150,000× the energy of this one
  3. Around the size people start to feel M 3.0 14× the energy of this one
  4. This earthquake M 2.2 about 69 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 37.6883, -120.1355. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mariposa County, CA 23 km (15 mi) WNW of here earthquakes near Mariposa County
Tuolumne County, CA 40 km (25 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) SSE of here earthquakes near Calaveras County
Merced County, CA 75 km (47 mi) NE of here earthquakes near Merced County
Stanislaus County, CA 78 km (48 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

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

  1. 1.6 21km SSW of Bootjack, CA
  2. 2.5 18km SE of Groveland-Big Oak Flat, CA
  3. 2.0 8km WSW of Mariposa, CA
  4. 1.9 14km SSW of Bootjack, CA
  5. 2.3 10km W of Ahwahnee, CA
  6. 1.9 19km SSW of Bootjack, CA
  7. 3.0 13km S of Mariposa, CA
  8. 1.6 10km S of Bootjack, CA
  9. 1.6 10km S of Bootjack, CA
  10. 1.9 3km WNW of Chinese Camp, CA
  11. 1.9 10km SSE of Bootjack, CA
  12. 1.6 11km SSE of Bootjack, CA
  13. 2.3 14km S of Groveland-Big Oak Flat, CA
  14. 2.1 10km SSE of Bootjack, CA
  15. 2.0 9km SW 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.