QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

9km E of Mammoth Lakes, CA

· -0.7 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mono County 32 kmMadera County 90 kmMariposa County 92 kmTuolumne County 106 kmMineral County 107 kmEsmeralda County 111 kmFresno County 118 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 1.8 (md)
Depth
-0.7 km below the surface
Felt
no reports yet
Nearest
Mono County, 32 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1559 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 37.6247, -118.8732. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mono County, CA 32 km (20 mi) S of here earthquakes near Mono County
Madera County, CA 90 km (56 mi) ENE of here earthquakes near Madera County
Mariposa County, CA 92 km (57 mi) E of here earthquakes near Mariposa County
Tuolumne County, CA 106 km (66 mi) ESE of here earthquakes near Tuolumne County
Mineral County, NV 107 km (66 mi) SSW of here earthquakes near Mineral County
Esmeralda County, NV 111 km (69 mi) W of here earthquakes near Esmeralda County

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

Aftershocks so far

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

  1. 2.5 19km SE of Yosemite Valley, CA
  2. 1.6 18km SE of Yosemite Valley, CA
  3. 1.9 14km SE of Mammoth Lakes, CA
  4. 2.8 9km SSE of Mammoth Lakes, CA
  5. 2.9 13km SE of Mammoth Lakes, CA
  6. 1.7 39km NNE of Toms Place, CA
  7. 1.9 7km SE of Round Valley, CA
  8. 2.5 8km SSE of Round Valley, CA
  9. 2.0 8km WSW of West Bishop, CA
  10. 3.4 8km SSE of Round Valley, CA
  11. 1.6 7km ENE of Mammoth Lakes, CA
  12. 1.9 12km ESE of Mammoth Lakes, CA
  13. 1.8 9km NNW of West Bishop, CA
  14. 2.6 9km ENE of Round Valley, CA
  15. 1.5 16km WSW 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 5.2 on 2020-04-11 — it released about 140,000 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.