QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9mw

15 km S of Mammoth Lakes, California

· 0.9 km deep · released about 10 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mono County 46 kmMadera County 78 kmMariposa County 85 kmFresno County 104 kmTuolumne County 106 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 3.9 (mw)
Depth
0.9 km below the surface
Felt
10 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Mono County, 46 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3009 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 10 people have reported feeling it to USGS.

How big was it?

This earthquake released about 10 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 17,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 760× the energy of this one
  3. Magna, Utah 2020 M 5.7 540× the energy of this one
  4. This earthquake M 3.9 about 10 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 21× 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 37.5083, -118.9543. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mono County, CA 46 km (28 mi) S of here earthquakes near Mono County
Madera County, CA 78 km (48 mi) ENE of here earthquakes near Madera County
Mariposa County, CA 85 km (53 mi) E of here earthquakes near Mariposa County
Fresno County, CA 104 km (64 mi) NE of here earthquakes near Fresno County
Tuolumne County, CA 106 km (66 mi) ESE of here earthquakes near Tuolumne County
Esmeralda County, NV 120 km (75 mi) WSW of here earthquakes near Esmeralda County

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

Aftershocks so far

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

  1. 1.6 9 km WSW of Aspen Springs, California
  2. 2.2 9 km WSW of Aspen Springs, California
  3. 2.4 8 km W of Aspen Springs, California
  4. 1.8 7 km W of Aspen Springs, California
  5. 1.8 8 km SW of Mammoth Lakes, California
  6. 1.9 11 km E of Mammoth Lakes, California
  7. 2.5 11 km E of Mammoth Lakes, California
  8. 1.8 11 km E of Mammoth Lakes, California
  9. 2.6 11 km E of Mammoth Lakes, California
  10. 1.7 11 km E of Mammoth Lakes, California
  11. 1.7 11 km E of Mammoth Lakes, California
  12. 1.7 11 km E of Mammoth Lakes, California
  13. 2.4 11 km E of Mammoth Lakes, California
  14. 2.3 11 km E of Mammoth Lakes, California
  15. 2.4 11 km E of Mammoth Lakes, 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.

On USGS

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