QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

5km NNW of Big Bear City, CA

· 4.5 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Bernardino County 87 kmRiverside County 102 kmOrange County 110 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
4.5 km below the surface
Felt
no reports yet
Nearest
San Bernardino County, 87 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2154 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 17 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 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× the energy of this one
  4. This earthquake M 1.8 about 17 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 34.3042, -116.8612. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Bernardino County, CA 87 km (54 mi) SW of here earthquakes near San Bernardino County
Riverside County, CA 102 km (63 mi) NW of here earthquakes near Riverside County
Orange County, CA 110 km (68 mi) NE of here earthquakes near Orange 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. 2.3 6km S of Beaumont, CA
  2. 1.5 6km SSW of Redlands, CA
  3. 2.5 18km N of Banning, CA
  4. 1.6 5km SSW of Redlands, CA
  5. 1.8 1km ENE of Loma Linda, CA
  6. 1.6 17km NNW of Morongo Valley, CA
  7. 1.6 7km WNW of Garnet, CA
  8. 1.8 4km SE of Loma Linda, CA
  9. 1.8 1km ESE of Loma Linda, CA
  10. 1.7 2km E of Loma Linda, CA
  11. 2.9 2km E of Loma Linda, CA
  12. 1.5 22km N of Yucca Valley, CA
  13. 1.9 12km WSW of Morongo Valley, CA
  14. 1.7 30km WSW of Ludlow, CA
  15. 1.5 10km NE of Running Springs, 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 9,400 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.