QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9mw

6km SE of Round Valley, CA

· 9.3 km deep · released about 10 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mono County 66 kmEsmeralda County 91 kmMadera County 109 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
9.3 km below the surface
Felt
122 reports · strongest reported intensity III
Measured shaking
intensity VI (ShakeMap)
USGS impact alert
green
Nearest
Mono County, 66 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2656 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 122 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 37.3823, -118.5382. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mono County, CA 66 km (41 mi) SSE of here earthquakes near Mono County
Esmeralda County, NV 91 km (57 mi) WSW of here earthquakes near Esmeralda County
Madera County, CA 109 km (68 mi) E of here earthquakes near Madera County
Fresno County, CA 121 km (75 mi) NE of here earthquakes near Fresno County
Inyo County, CA 136 km (84 mi) NW of here earthquakes near Inyo 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. 2.7 16km WSW of Toms Place, CA
  2. 1.5 12km E of Mammoth Lakes, CA
  3. 1.8 10km NE of Big Pine, CA
  4. 1.5 8 km ENE of Dixon Lane-Meadow Creek, California
  5. 1.6 2km NE of Dixon Lane-Meadow Creek, CA
  6. 1.7 18km SW of Toms Place, CA
  7. 1.7 10km SSW of Round Valley, CA
  8. 2.9 5km ENE of Round Valley, CA
  9. 1.6 5km ENE of Round Valley, CA
  10. 1.6 13km WSW of Toms Place, CA
  11. 1.5 5km NNE of Wilkerson, CA
  12. 2.1 22km SW of Toms Place, CA
  13. 1.5 10km S of Toms Place, CA
  14. 2.2 14km SE of Mammoth Lakes, CA
  15. 1.5 16km SSE 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 22 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.