QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

9km NNW of Ahwahnee, CA

· 25 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mariposa County 20 kmMadera County 25 kmTuolumne County 67 kmFresno County 76 kmMerced County 88 kmMono County 96 kmCalaveras County 108 kmStanislaus County 109 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 1.9 (md)
Depth
25 km below the surface
Felt
no reports yet
Nearest
Mariposa County, 20 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2280 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 37.4352, -119.7752. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mariposa County, CA 20 km (12 mi) SE of here earthquakes near Mariposa County
Madera County, CA 25 km (16 mi) N of here earthquakes near Madera County
Tuolumne County, CA 67 km (42 mi) SSE of here earthquakes near Tuolumne County
Fresno County, CA 76 km (47 mi) N of here earthquakes near Fresno County
Merced County, CA 88 km (55 mi) ENE of here earthquakes near Merced County
Mono County, CA 96 km (59 mi) WSW of here earthquakes near Mono County

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

Aftershocks so far

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

  1. 1.6 23km SE of Yosemite Valley, CA
  2. 2.5 20km SE of Yosemite Valley, CA
  3. 1.6 20km SE of Yosemite Valley, CA
  4. 2.5 20km SE of Yosemite Valley, CA
  5. 1.8 21km SE of Yosemite Valley, CA
  6. 2.3 16km SSW of Bootjack, CA
  7. 1.6 20km SE of Yosemite Valley, CA
  8. 2.7 19km SE of Yosemite Valley, CA
  9. 2.6 20km SE of Yosemite Valley, CA
  10. 2.8 19km SE of Yosemite Valley, CA
  11. 1.6 20km SE of Yosemite Valley, CA
  12. 2.3 20km ESE of Yosemite Valley, CA
  13. 1.9 18km SE of Yosemite Valley, CA
  14. 2.6 20km SE of Yosemite Valley, CA
  15. 2.5 19km SE of Yosemite Valley, 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.