QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

14km SSE of Mammoth Lakes, CA

· 4.3 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mono County 43 kmMadera County 84 kmMariposa County 90 kmFresno County 109 kmTuolumne County 109 kmEsmeralda County 114 kmMineral 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 2.1 (md)
Depth
4.3 km below the surface
Felt
no reports yet
Nearest
Mono County, 43 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1501 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 40 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 37.5288, -118.8897. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mono County, CA 43 km (27 mi) S of here earthquakes near Mono County
Madera County, CA 84 km (52 mi) ENE of here earthquakes near Madera County
Mariposa County, CA 90 km (56 mi) E of here earthquakes near Mariposa County
Fresno County, CA 109 km (68 mi) NE of here earthquakes near Fresno County
Tuolumne County, CA 109 km (68 mi) ESE of here earthquakes near Tuolumne County
Esmeralda County, NV 114 km (71 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

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

  1. 1.7 29km NE of Oakhurst, CA
  2. 1.7 29km NE of Oakhurst, CA
  3. 2.0 14km WNW of Toms Place, CA
  4. 1.6 15km SE of Mammoth Lakes, CA
  5. 1.9 6km SSE of Round Valley, CA
  6. 2.5 28km NE of Oakhurst, CA
  7. 1.7 17km WSW of Toms Place, CA
  8. 1.6 10km W of Toms Place, CA
  9. 1.7 10km W of Toms Place, CA
  10. 1.8 17km WSW of Toms Place, CA
  11. 1.8 10km SSW of Mammoth Lakes, CA
  12. 2.3 11km ESE of Mammoth Lakes, CA
  13. 2.9 11km ESE of Mammoth Lakes, CA
  14. 1.5 6km ESE of Round Valley, CA
  15. 1.6 11km ESE 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 4.4 on 2020-02-01 — it released about 3,100 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.