QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

9 km ESE of North Fork, CA

· 26 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 29 kmFresno County 56 kmMariposa County 58 kmMono County 90 kmTuolumne County 100 kmMerced County 116 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 1.8 (md)
Depth
26 km below the surface
Felt
no reports yet
Nearest
Madera County, 29 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 769 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 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 37.2298, -119.4183. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 29 km (18 mi) E of here earthquakes near Madera County
Fresno County, CA 56 km (35 mi) NNE of here earthquakes near Fresno County
Mariposa County, CA 58 km (36 mi) SE of here earthquakes near Mariposa County
Mono County, CA 90 km (56 mi) SSW of here earthquakes near Mono County
Tuolumne County, CA 100 km (62 mi) SSE of here earthquakes near Tuolumne County
Merced County, CA 116 km (72 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

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

  1. 1.9 4 km W of Oakhurst, CA
  2. 1.6 5 km NE of Oakhurst, CA
  3. 1.8 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
  4. 1.9 23 km SSW of Mammoth Lakes, CA
  5. 2.4 4 km ESE of Friant, CA
  6. 1.8 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
  7. 1.7 23 km SSW of Mammoth Lakes, CA
  8. 2.8 23 km SSW of Mammoth Lakes, CA
  9. 3.0 23 km SSW of Mammoth Lakes, CA
  10. 1.9 22 km SE of Yosemite Valley, CA
  11. 1.6 26 km SSW of Mammoth Lakes, CA
  12. 1.7 7 km E of Bonadelle Ranchos-Madera Ranchos, CA
  13. 2.0 11 km ENE of North Fork, CA
  14. 1.7 30 km NE of North Fork, CA
  15. 1.6 34 km NE of North Fork, 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.