QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

21km ENE of Le Grand, CA

· 16 km deep · released about 1.8 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 26 kmMariposa County 33 kmMerced County 63 kmFresno County 68 kmTuolumne County 81 kmStanislaus County 91 kmCalaveras County 110 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 3.4 (ml)
Depth
16 km below the surface
Felt
207 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Madera County, 26 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1271 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 207 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 95,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,000× the energy of this one
  4. This earthquake M 3.4 about 1.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.7× more

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 37.2952, -120.0280. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 26 km (16 mi) WNW of here earthquakes near Madera County
Mariposa County, CA 33 km (20 mi) SSW of here earthquakes near Mariposa County
Merced County, CA 63 km (39 mi) E of here earthquakes near Merced County
Fresno County, CA 68 km (42 mi) NNW of here earthquakes near Fresno County
Tuolumne County, CA 81 km (50 mi) S of here earthquakes near Tuolumne County
Stanislaus County, CA 91 km (57 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

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

  1. 1.9 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
  2. 2.3 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
  3. 2.4 7 km SSW of Mariposa, CA
  4. 2.3 10 km SSW of Mariposa, CA
  5. 2.2 1 km ENE of Yosemite Lakes, CA
  6. 1.8 5 km E of Yosemite Lakes, CA
  7. 2.6 4 km ENE of Yosemite Lakes, CA
  8. 1.8 10 km NW of Auberry, CA
  9. 2.3 10 km SSW of Mariposa, CA
  10. 2.0 10 km SSW of Mariposa, CA
  11. 2.3 11 km SSW of Mariposa, CA
  12. 2.8 10 km SSW of Mariposa, CA
  13. 2.0 9 km SSW of Mariposa, CA
  14. 2.7 8 km SW of Mariposa, CA
  15. 2.2 9 km SSW of Mariposa, 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.