QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

6km W of Mammoth Lakes, CA

· -0.1 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mono County 34 kmMariposa County 77 kmMadera County 79 kmTuolumne County 91 kmMineral County 111 kmFresno County 112 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
-0.1 km below the surface
Felt
no reports yet
Nearest
Mono County, 34 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1217 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 37.6468, -119.0475. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mono County, CA 34 km (21 mi) SSW of here earthquakes near Mono County
Mariposa County, CA 77 km (48 mi) E of here earthquakes near Mariposa County
Madera County, CA 79 km (49 mi) NE of here earthquakes near Madera County
Tuolumne County, CA 91 km (56 mi) ESE of here earthquakes near Tuolumne County
Mineral County, NV 111 km (69 mi) SSW of here earthquakes near Mineral County
Fresno County, CA 112 km (70 mi) NNE of here earthquakes near Fresno County

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

Aftershocks so far

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

  1. 2.0 15 km SE of Mammoth Lakes, CA
  2. 1.8 16 km SW of Toms Place, CA
  3. 1.7 12 km SE of Mammoth Lakes, CA
  4. 2.3 12 km SE of Mammoth Lakes, CA
  5. 2.0 12 km SE of Mammoth Lakes, CA
  6. 1.5 14 km WSW of Toms Place, CA
  7. 1.7 15 km S of Mammoth Lakes, CA
  8. 1.5 16 km SW of Toms Place, CA
  9. 1.9 1 km SSW of Round Valley, CA
  10. 2.0 16 km WSW of Toms Place, CA
  11. 1.7 12 km W of Toms Place, CA
  12. 2.5 12 km WSW of Toms Place, CA
  13. 3.0 16 km WSW of Toms Place, CA
  14. 1.6 14 km W of Toms Place, CA
  15. 1.9 16 km ESE 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2020-02-01 — it released about 9,100 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.