QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

20 km ENE of Mi-Wuk Village, CA

· 11 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tuolumne County 16 kmCalaveras County 49 kmAlpine County 53 kmAmador County 65 kmMariposa County 66 kmEl Dorado County 83 kmDouglas County 89 kmMono County 102 kmMadera County 109 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 2.1 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Tuolumne County, 16 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 692 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 40 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 38.1663, -119.9962. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tuolumne County, CA 16 km (10 mi) N of here earthquakes near Tuolumne County
Calaveras County, CA 49 km (30 mi) E of here earthquakes near Calaveras County
Alpine County, CA 53 km (33 mi) SSW of here earthquakes near Alpine County
Amador County, CA 65 km (40 mi) ESE of here earthquakes near Amador County
Mariposa County, CA 66 km (41 mi) N of here earthquakes near Mariposa County
El Dorado County, CA 83 km (52 mi) SE of here earthquakes near El Dorado County

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

Aftershocks so far

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

  1. 2.2 18 km NE of Dardanelle, CA
  2. 2.2 13 km SW of Walker, CA
  3. 1.7 12 km SW of Walker, California
  4. 1.5 14 km SSW of Walker, California
  5. 2.1 22 km SSW 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.