QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

20km ESE of Yosemite Valley, CA

· 4.5 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mariposa County 47 kmMono County 54 kmMadera County 58 kmTuolumne County 66 kmFresno County 101 kmAlpine County 115 kmCalaveras County 119 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
4.5 km below the surface
Felt
no reports yet
Nearest
Mariposa County, 47 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1602 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 37.6428, -119.3862. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mariposa County, CA 47 km (29 mi) E of here earthquakes near Mariposa County
Mono County, CA 54 km (34 mi) SW of here earthquakes near Mono County
Madera County, CA 58 km (36 mi) NNE of here earthquakes near Madera County
Tuolumne County, CA 66 km (41 mi) SE of here earthquakes near Tuolumne County
Fresno County, CA 101 km (63 mi) NNE of here earthquakes near Fresno County
Alpine County, CA 115 km (71 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

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

  1. 3.4 20km SE of Yosemite Valley, CA
  2. 1.7 11km ENE of Mammoth Lakes, CA
  3. 1.8 3km SW of Mammoth Lakes, CA
  4. 2.4 20km SE of Yosemite Valley, CA
  5. 1.8 20km ESE of Yosemite Valley, CA
  6. 2.2 20km SE of Yosemite Valley, CA
  7. 1.6 22km ESE of Yosemite Valley, CA
  8. 1.6 21km SE of Yosemite Valley, CA
  9. 2.0 19km SE of Yosemite Valley, CA
  10. 1.7 20km SE of Yosemite Valley, CA
  11. 2.6 20km SE of Yosemite Valley, CA
  12. 3.1 20km SE of Yosemite Valley, CA
  13. 1.6 20km SE of Yosemite Valley, CA
  14. 2.4 20km ESE of Yosemite Valley, CA
  15. 2.3 18 km SE of Yosemite Valley, California

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 4.0 on 2020-04-05 — it released about 2,500 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.