QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

12km NNE of Round Valley, CA

· 10 km deep · released about 1,600 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mono County 53 kmEsmeralda County 86 kmMadera County 111 kmMineral County 112 kmMariposa County 120 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 3.1 (ml)
Depth
10 km below the surface
Felt
29 reports · strongest reported intensity III
Nearest
Mono County, 53 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1955 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 29 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,600 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 210,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,700× the energy of this one
  4. This earthquake M 3.1 about 1,600 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.7× 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 37.5162, -118.5535. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mono County, CA 53 km (33 mi) SSE of here earthquakes near Mono County
Esmeralda County, NV 86 km (54 mi) WSW of here earthquakes near Esmeralda County
Madera County, CA 111 km (69 mi) ENE of here earthquakes near Madera County
Mineral County, NV 112 km (70 mi) S of here earthquakes near Mineral County
Mariposa County, CA 120 km (75 mi) E of here earthquakes near Mariposa County
Fresno County, CA 129 km (80 mi) NE of here earthquakes near Fresno County

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

Aftershocks so far

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

  1. 1.6 2km E of Round Valley, CA
  2. 1.9 4km ENE of Round Valley, CA
  3. 2.0 3km NNE of Wilkerson, CA
  4. 2.1 13km W of Toms Place, CA
  5. 1.8 8km WNW of Round Valley, CA
  6. 3.1 9km WSW of Toms Place, CA
  7. 1.6 40km NNE of Toms Place, CA
  8. 2.9 9km W of Toms Place, CA
  9. 1.5 20km NNW of Toms Place, CA
  10. 1.5 39km NNE of Toms Place, CA
  11. 2.8 13km W of Toms Place, CA
  12. 1.8 2km NNE of Wilkerson, CA
  13. 2.5 2km S of Round Valley, CA
  14. 1.6 13km SE of Mammoth Lakes, CA
  15. 1.8 13km SE 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 4.8 on 2016-02-16 — it released about 270 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.