QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

20km SE of Yosemite Valley, CA

· 12 km deep · released about 1.9 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mariposa County 47 kmMono County 55 kmMadera County 57 kmTuolumne County 66 kmFresno County 100 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 3.4 (ml)
Depth
12 km below the surface
Felt
25 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
Nearest
Mariposa County, 47 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2073 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 25 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 89,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,800× the energy of this one
  4. This earthquake M 3.4 about 1.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4× more

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 37.6392, -119.3898. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mariposa County, CA 47 km (29 mi) E of here earthquakes near Mariposa County
Mono County, CA 55 km (34 mi) SW of here earthquakes near Mono County
Madera County, CA 57 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 100 km (62 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

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

  1. 2.9 12km ESE of Mammoth Lakes, CA
  2. 1.6 8km E of Mammoth Lakes, CA
  3. 1.7 22km ESE of Yosemite Valley, CA
  4. 2.7 16km SE of Mammoth Lakes, CA
  5. 2.6 8km E of Mammoth Lakes, CA
  6. 2.9 14km SSE of Mammoth Lakes, CA
  7. 2.0 14km SSE of Mammoth Lakes, CA
  8. 2.0 3km E of Mammoth Lakes, CA
  9. 2.5 9km E of Mammoth Lakes, CA
  10. 1.7 7 km SE of Mammoth Lakes, California
  11. 1.8 9km E of Mammoth Lakes, CA
  12. 1.9 9km E of Mammoth Lakes, CA
  13. 1.9 9km E of Mammoth Lakes, CA
  14. 1.7 8km E of Mammoth Lakes, CA
  15. 1.7 8km E of Mammoth Lakes, 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 4.0 on 2020-04-05 — it released about 9.4 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.