QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

15 km SSW of Bootjack, CA

· 23 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 22 kmMariposa County 26 kmFresno County 69 kmMerced County 71 kmTuolumne County 76 kmStanislaus County 97 kmCalaveras County 109 kmMono County 114 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
23 km below the surface
Felt
no reports yet
Nearest
Madera County, 22 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 468 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 49 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 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× 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 49 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 37.3375, -119.9392. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 22 km (14 mi) NW of here earthquakes near Madera County
Mariposa County, CA 26 km (16 mi) S of here earthquakes near Mariposa County
Fresno County, CA 69 km (43 mi) NNW of here earthquakes near Fresno County
Merced County, CA 71 km (44 mi) ENE of here earthquakes near Merced County
Tuolumne County, CA 76 km (47 mi) S of here earthquakes near Tuolumne County
Stanislaus County, CA 97 km (60 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

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

  1. 2.0 8 km ESE of Coarsegold, CA
  2. 2.0 9 km ESE of Coarsegold, CA
  3. 2.0 7 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  4. 1.8 6 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  5. 1.7 8 km ESE of Coarsegold, CA
  6. 2.7 8 km NW of Yosemite Lakes, CA
  7. 2.1 11 km S of Yosemite Lakes, CA
  8. 1.9 6 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  9. 1.7 6 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  10. 2.2 17 km NW of Yosemite Lakes, CA
  11. 2.1 12 km NNW of Friant, CA
  12. 2.1 17 km NW of Yosemite Lakes, CA
  13. 1.8 10 km SW of Yosemite Village, CA
  14. 2.3 10 km WSW of Mariposa, CA
  15. 2.7 6 km WSW of Friant, 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.