QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mw

16km WSW of Toms Place, CA

· 7.8 km deep · released about 18 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mono County 43 kmMadera County 87 kmMariposa County 94 kmFresno County 111 kmEsmeralda County 111 kmTuolumne County 112 kmMineral County 116 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 4.0 (mw)
Depth
7.8 km below the surface
Felt
449 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Nearest
Mono County, 43 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2284 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 449 people have reported feeling it to USGS.

How big was it?

This earthquake released about 18 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 9,400× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 420× the energy of this one
  3. Magna, Utah 2020 M 5.7 300× the energy of this one
  4. This earthquake M 4.0 about 18 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 38× 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 37.5272, -118.8527. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mono County, CA 43 km (27 mi) S of here earthquakes near Mono County
Madera County, CA 87 km (54 mi) ENE of here earthquakes near Madera County
Mariposa County, CA 94 km (58 mi) E of here earthquakes near Mariposa County
Fresno County, CA 111 km (69 mi) NE of here earthquakes near Fresno County
Esmeralda County, NV 111 km (69 mi) WSW of here earthquakes near Esmeralda County
Tuolumne County, CA 112 km (70 mi) ESE of here earthquakes near Tuolumne 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. 2.4 14km S of Mammoth Lakes, CA
  2. 3.1 14km S of Mammoth Lakes, CA
  3. 2.4 13km S of Mammoth Lakes, CA
  4. 2.3 14km S of Mammoth Lakes, CA
  5. 1.5 13km S of Mammoth Lakes, CA
  6. 2.4 6km S of Mammoth Lakes, CA
  7. 1.9 13km W of Toms Place, CA
  8. 2.3 14km S of Mammoth Lakes, CA
  9. 2.0 8km E of Mammoth Lakes, CA
  10. 1.8 6km E of Mammoth Lakes, CA
  11. 2.5 14km SSE of Mammoth Lakes, CA
  12. 2.3 14km SSE of Mammoth Lakes, CA
  13. 2.8 8km E of Mammoth Lakes, CA
  14. 2.8 9km N of Round Valley, CA
  15. 1.8 1km ENE of Bishop, 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 3.5 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.