QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

23 km SE of Yosemite Valley, CA

· 19 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mariposa County 49 kmMono County 53 kmMadera County 58 kmTuolumne County 69 kmFresno County 100 kmAlpine County 117 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
19 km below the surface
Felt
no reports yet
Nearest
Mariposa County, 49 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 446 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 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 37.6270, -119.3542. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mariposa County, CA 49 km (31 mi) E of here earthquakes near Mariposa County
Mono County, CA 53 km (33 mi) SW of here earthquakes near Mono County
Madera County, CA 58 km (36 mi) NE of here earthquakes near Madera County
Tuolumne County, CA 69 km (43 mi) SE of here earthquakes near Tuolumne County
Fresno County, CA 100 km (62 mi) NNE of here earthquakes near Fresno County
Alpine County, CA 117 km (73 mi) SSE of here earthquakes near Alpine County

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

Aftershocks so far

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

  1. 1.8 18 km WSW of Toms Place, CA
  2. 1.6 12 km SSE of Mammoth Lakes, CA
  3. 2.8 21 km SW of Toms Place, CA
  4. 1.6 20 km ESE of Yosemite Valley, CA
  5. 2.6 20 km S of Mammoth Lakes, CA
  6. 1.5 19 km SSW of Mammoth Lakes, CA
  7. 2.0 20 km SW of Toms Place, CA
  8. 1.8 16 km ESE of Yosemite Valley, CA
  9. 2.2 17 km WSW of Toms Place, CA
  10. 1.6 13 km WSW of Toms Place, CA
  11. 2.5 22 km S of Mammoth Lakes, CA
  12. 1.9 22 km SW of Toms Place, CA
  13. 1.6 22 km SW of Toms Place, CA
  14. 1.6 22 km SW of Toms Place, CA
  15. 1.5 22 km SW of Toms Place, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2020-02-01 — it released about 7,400 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.