QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

14km S of Big Bear Lake, CA

· 7.2 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 93 kmRiverside County 94 kmSan Bernardino County 106 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 (ml)
Depth
7.2 km below the surface
Felt
no reports yet
Nearest
Orange County, 93 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2062 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 34.1133, -116.9135. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 93 km (58 mi) ENE of here earthquakes near Orange County
Riverside County, CA 94 km (59 mi) WNW of here earthquakes near Riverside County
San Bernardino County, CA 106 km (66 mi) SW of here earthquakes near San Bernardino County

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

Aftershocks so far

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

  1. 2.6 1km ESE of Loma Linda, CA
  2. 1.7 6km S of Redlands, CA
  3. 1.8 3km WNW of Valle Vista, CA
  4. 1.6 2km NE of Colton, CA
  5. 1.7 2km NNE of Colton, CA
  6. 1.5 4km NE of Beaumont, CA
  7. 1.6 9km SW of Idyllwild, CA
  8. 2.0 11km NNE of Running Springs, CA
  9. 1.6 14km E of Yucaipa, CA
  10. 2.5 3km SW of San Bernardino, CA
  11. 1.8 6km SW of Idyllwild, CA
  12. 1.6 6km E of Calimesa, CA
  13. 2.4 12km N of Banning, CA
  14. 1.8 4km W of Beaumont, CA
  15. 1.6 1km NW of Loma Linda, 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 4.5 on 2018-05-08 — it released about 12,000 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.