QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

9km NNW of Big Bear Lake, CA

· 2.3 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Bernardino County 91 kmOrange County 106 kmRiverside County 108 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
2.3 km below the surface
Felt
no reports yet
Nearest
San Bernardino County, 91 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3134 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 13 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 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× the energy of this one
  4. This earthquake M 1.8 about 13 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 34.3240, -116.9337. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Bernardino County, CA 91 km (56 mi) SW of here earthquakes near San Bernardino County
Orange County, CA 106 km (66 mi) NE of here earthquakes near Orange County
Riverside County, CA 108 km (67 mi) NW of here earthquakes near Riverside County

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

Aftershocks so far

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

  1. 3.2 6km NNE of Moreno Valley, CA
  2. 1.5 5km SE of Loma Linda, CA
  3. 2.3 7km NNW of Highland, CA
  4. 1.6 5km SE of Lytle Creek, CA
  5. 2.1 40km NE of Big Bear City, CA
  6. 2.2 9km N of Cabazon, CA
  7. 1.6 3km SE of Loma Linda, CA
  8. 1.5 5km SE of Loma Linda, CA
  9. 1.7 8km SSW of Big Bear Lake, CA
  10. 1.7 11km N of Big Bear Lake, CA
  11. 2.1 6km NNE of Banning, CA
  12. 1.7 2km NNE of Colton, CA
  13. 3.0 6km NE of Fontana, CA
  14. 2.1 4km ESE of Lytle Creek, CA
  15. 3.2 4km ESE of Lytle Creek, 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 2016-01-06 — it released about 8,800 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.