QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

2km SSW of North Fork, CA

· 32 km deep · released about 420 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 20 kmFresno County 52 kmMariposa County 53 kmMono County 97 kmTuolumne County 98 kmMerced 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 2.8 (md)
Depth
32 km below the surface
Felt
6 reports · strongest reported intensity II
Nearest
Madera County, 20 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1115 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 6 people have reported feeling it to USGS.

How big was it?

This earthquake released about 420 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 36,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 26,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.3× the energy of this one
  4. This earthquake M 2.8 about 420 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 37.2133, -119.5218. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 20 km (13 mi) E of here earthquakes near Madera County
Fresno County, CA 52 km (32 mi) NNE of here earthquakes near Fresno County
Mariposa County, CA 53 km (33 mi) SE of here earthquakes near Mariposa County
Mono County, CA 97 km (60 mi) SW of here earthquakes near Mono County
Tuolumne County, CA 98 km (61 mi) SSE of here earthquakes near Tuolumne County
Merced County, CA 106 km (66 mi) E of here earthquakes near Merced County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.6 4 km ENE of Yosemite Lakes, CA
  2. 1.8 10 km NW of Auberry, CA
  3. 1.5 26 km SSW of Mammoth Lakes, CA
  4. 1.9 26 km SSW of Mammoth Lakes, CA
  5. 1.8 25 km SSW of Mammoth Lakes, CA
  6. 2.3 10 km SSW of Mariposa, CA
  7. 1.7 27 km ENE of Oakhurst, CA
  8. 2.0 10 km SSW of Mariposa, CA
  9. 2.3 11 km SSW of Mariposa, CA
  10. 2.8 10 km SSW of Mariposa, CA
  11. 2.1 28 km ENE of Oakhurst, CA
  12. 2.0 9 km SSW of Mariposa, CA
  13. 1.5 32 km SSW of Mammoth Lakes, 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.