QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

13 km SSW of Mariposa, CA

· 21 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mariposa County 24 kmMadera County 29 kmMerced County 67 kmTuolumne County 72 kmFresno County 75 kmStanislaus County 91 kmCalaveras County 103 kmMono County 116 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
21 km below the surface
Felt
no reports yet
Nearest
Mariposa County, 24 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 464 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 51 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 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 51 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 37.3720, -120.0012. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mariposa County, CA 24 km (15 mi) SSW of here earthquakes near Mariposa County
Madera County, CA 29 km (18 mi) NW of here earthquakes near Madera County
Merced County, CA 67 km (42 mi) ENE of here earthquakes near Merced County
Tuolumne County, CA 72 km (45 mi) S of here earthquakes near Tuolumne County
Fresno County, CA 75 km (46 mi) NNW of here earthquakes near Fresno County
Stanislaus County, CA 91 km (56 mi) ESE of here earthquakes near Stanislaus County

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

Aftershocks so far

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

  1. 2.2 12 km NNE of Friant, CA
  2. 1.7 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
  3. 2.0 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
  4. 2.1 11 km SSW of Mariposa, CA
  5. 1.6 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
  6. 2.1 15 km SSW of Bootjack, CA
  7. 1.8 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
  8. 2.0 5 km S of Oakhurst, CA
  9. 2.0 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
  10. 1.9 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
  11. 1.8 18 km SW of Bootjack, CA
  12. 1.6 5 km NE of Oakhurst, CA
  13. 2.1 3 km WNW of Oakhurst, CA
  14. 1.9 4 km W of Oakhurst, CA
  15. 1.6 5 km NE of Oakhurst, 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.