QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

19km SSW of Mariposa, CA

· 20 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 28 kmMariposa County 30 kmMerced County 63 kmFresno County 71 kmTuolumne County 78 kmStanislaus County 90 kmCalaveras County 107 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
20 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Madera County, 28 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1681 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 38 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 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 37.3227, -120.0315. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 28 km (17 mi) WNW of here earthquakes near Madera County
Mariposa County, CA 30 km (19 mi) SSW of here earthquakes near Mariposa County
Merced County, CA 63 km (39 mi) ENE of here earthquakes near Merced County
Fresno County, CA 71 km (44 mi) NNW of here earthquakes near Fresno County
Tuolumne County, CA 78 km (48 mi) S of here earthquakes near Tuolumne County
Stanislaus County, CA 90 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

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

  1. 2.3 10km SSW of Mariposa, CA
  2. 1.7 22km ENE of Le Grand, CA
  3. 2.1 22km ENE of Le Grand, CA
  4. 1.6 7km NE of Bonadelle Ranchos-Madera Ranchos, CA
  5. 1.7 6km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  6. 2.3 21km SSW of Bootjack, CA
  7. 2.1 12km SSW of Yosemite Lakes, CA
  8. 2.4 10km SSW of Mariposa, CA
  9. 1.6 22km SSW of Bootjack, CA
  10. 2.1 6km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  11. 2.3 21km S of Mariposa, CA
  12. 2.3 21km S of Mariposa, CA
  13. 1.7 22km SSW of Bootjack, CA
  14. 1.8 12km NW of Yosemite Lakes, CA
  15. 1.9 6km ENE of Bonadelle Ranchos-Madera Ranchos, 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.