QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

19km SSW of Mariposa, CA

· 20 km deep · released about 990 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 29 kmMariposa County 30 kmMerced County 62 kmFresno County 72 kmTuolumne County 77 kmStanislaus County 89 kmCalaveras County 106 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 3.0 (ml)
Depth
20 km below the surface
Felt
202 reports · strongest reported intensity III
Nearest
Madera County, 29 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1351 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 202 people have reported feeling it to USGS.

How big was it?

This earthquake released about 990 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 340,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 990 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 37.3278, -120.0412. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 29 km (18 mi) WNW of here earthquakes near Madera County
Mariposa County, CA 30 km (18 mi) SSW of here earthquakes near Mariposa County
Merced County, CA 62 km (39 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 77 km (48 mi) S of here earthquakes near Tuolumne County
Stanislaus County, CA 89 km (55 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

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

  1. 2.4 9 km SSW of Mariposa, CA
  2. 1.9 12 km W of Auberry, CA
  3. 1.9 7 km NNE of Friant, CA
  4. 2.2 14 km SW of Bootjack, CA
  5. 2.0 8 km SW of Ahwahnee, CA
  6. 1.5 9 km W of Ahwahnee, CA
  7. 2.1 5 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  8. 2.1 6km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  9. 2.8 2km SSW of North Fork, CA
  10. 2.0 9km SSW of Mariposa, CA
  11. 2.3 10km S of Mariposa, CA
  12. 2.2 9km SSW of Mariposa, CA
  13. 2.2 10km SSW of Mariposa, CA
  14. 2.0 11km S of Mariposa, CA
  15. 2.0 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.