QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

6km NNW of Ahwahnee, CA

· 24 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mariposa County 23 kmMadera County 23 kmTuolumne County 70 kmFresno County 73 kmMerced County 90 kmMono County 95 kmCalaveras County 112 kmStanislaus County 112 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
24 km below the surface
Felt
no reports yet
Nearest
Mariposa County, 23 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1956 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 37.4170, -119.7472. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mariposa County, CA 23 km (14 mi) SE of here earthquakes near Mariposa County
Madera County, CA 23 km (14 mi) N of here earthquakes near Madera County
Tuolumne County, CA 70 km (43 mi) SSE of here earthquakes near Tuolumne County
Fresno County, CA 73 km (46 mi) N of here earthquakes near Fresno County
Merced County, CA 90 km (56 mi) ENE of here earthquakes near Merced County
Mono County, CA 95 km (59 mi) SW of here earthquakes near Mono County

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

Aftershocks so far

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

  1. 2.5 18km SSW of Mariposa, CA
  2. 1.5 7km NE of Bonadelle Ranchos-Madera Ranchos, CA
  3. 1.8 29km NE of Oakhurst, CA
  4. 1.9 30km NE of Oakhurst, CA
  5. 2.1 6km NE of Bonadelle Ranchos-Madera Ranchos, CA
  6. 2.1 0km SW of Yosemite Lakes, CA
  7. 2.1 12km S of Yosemite Lakes, CA
  8. 2.1 6km NE of Bonadelle Ranchos-Madera Ranchos, CA
  9. 1.8 20km SE of Yosemite Valley, CA
  10. 1.6 7km N of Oakhurst, CA
  11. 1.7 7km W of Yosemite Lakes, CA
  12. 1.9 15km SE of Yosemite Valley, CA
  13. 1.6 32km NE of North Fork, CA
  14. 2.4 21km SSW of Bootjack, CA
  15. 1.9 6km NW 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.