QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

12km SSW of Bootjack, CA

· 15 km deep · released about 750 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mariposa County 24 kmMadera County 24 kmMerced County 71 kmFresno County 72 kmTuolumne County 73 kmStanislaus County 96 kmCalaveras County 106 kmMono County 113 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 2.9 (md)
Depth
15 km below the surface
Felt
146 reports · strongest reported intensity IV
Nearest
Mariposa County, 24 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3138 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 146 people have reported feeling it to USGS.

How big was it?

This earthquake released about 750 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 20,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 14,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.3× the energy of this one
  4. This earthquake M 2.9 about 750 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 37.3635, -119.9477. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mariposa County, CA 24 km (15 mi) S of here earthquakes near Mariposa County
Madera County, CA 24 km (15 mi) NW of here earthquakes near Madera County
Merced County, CA 71 km (44 mi) ENE of here earthquakes near Merced County
Fresno County, CA 72 km (45 mi) NNW of here earthquakes near Fresno County
Tuolumne County, CA 73 km (45 mi) S of here earthquakes near Tuolumne County
Stanislaus County, CA 96 km (59 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. 2.3 19km WNW of Yosemite Lakes, CA
  2. 1.8 3km W of Madera Acres, CA
  3. 2.3 6km W of Madera, CA
  4. 1.7 10km W of Ahwahnee, CA
  5. 1.6 2km NW of Oakhurst, CA
  6. 2.6 17km SSW of Bootjack, CA
  7. 1.8 17km SSW of Bootjack, CA
  8. 2.1 16km SSW of Bootjack, CA
  9. 1.6 17km SSW of Bootjack, CA
  10. 1.9 17km SSW of Bootjack, CA
  11. 1.9 12km NNE of North Fork, CA
  12. 2.1 2km E of Parkwood, CA
  13. 2.0 11km SSW of Mariposa, CA
  14. 1.6 22km NE of Ahwahnee, CA
  15. 2.3 9km NNE 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.