QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

31 km WSW of Round Valley, CA

· 14 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mono County 63 kmMadera County 74 kmMariposa County 90 kmFresno County 91 kmTuolumne 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
14 km below the surface
Felt
no reports yet
Nearest
Mono County, 63 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1076 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 37.3487, -118.9358. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mono County, CA 63 km (39 mi) S of here earthquakes near Mono County
Madera County, CA 74 km (46 mi) ENE of here earthquakes near Madera County
Mariposa County, CA 90 km (56 mi) ESE of here earthquakes near Mariposa County
Fresno County, CA 91 km (57 mi) NE of here earthquakes near Fresno County
Tuolumne County, CA 117 km (73 mi) SE of here earthquakes near Tuolumne County
Esmeralda County, NV 124 km (77 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

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

  1. 1.6 17 km SE of Mammoth Lakes, CA
  2. 1.6 16 km WSW of Toms Place, CA
  3. 1.7 16 km WSW of Toms Place, CA
  4. 2.8 12 km ESE of Mammoth Lakes, CA
  5. 1.6 12 km W of Toms Place, CA
  6. 1.8 17 km WSW of Toms Place, CA
  7. 1.5 8 km ENE of Round Valley, CA
  8. 1.5 12 km ESE of Mammoth Lakes, CA
  9. 2.1 12 km ESE of Mammoth Lakes, CA
  10. 1.8 16 km SW of Toms Place, CA
  11. 1.9 12 km SE of Mammoth Lakes, CA
  12. 1.6 16 km WSW of Toms Place, CA
  13. 1.6 16 km SW of Toms Place, CA
  14. 1.7 17 km SW of Toms Place, CA
  15. 1.8 17 km SW of Toms Place, 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 4.8 on 2016-02-16 — it released about 11,000 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.