QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

5km SSW of Big Bear Lake, CA

· 8.8 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 97 kmSan Bernardino County 100 kmRiverside County 100 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 3.1 (ml)
Depth
8.8 km below the surface
Felt
47 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Orange County, 97 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1226 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 47 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 260,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,200× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 34.1997, -116.9315. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 97 km (61 mi) NE of here earthquakes near Orange County
San Bernardino County, CA 100 km (62 mi) SW of here earthquakes near San Bernardino County
Riverside County, CA 100 km (62 mi) WNW of here earthquakes near Riverside 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. 1.5 9km NNE of Banning, CA
  2. 2.3 8km NNE of Banning, CA
  3. 1.7 2km E of San Jacinto, CA
  4. 1.8 5km N of Yucca Valley, CA
  5. 2.6 28km NNW of Yucca Valley, CA
  6. 2.2 11km WNW of Garnet, CA
  7. 2.0 4km N of Cabazon, CA
  8. 1.9 12km NNE of Banning, CA
  9. 1.7 2km NNE of Colton, CA
  10. 1.8 10km NW of Big Bear Lake, CA
  11. 1.6 2km N of Colton, CA
  12. 1.7 2km NNE of Colton, CA
  13. 2.8 8km NE of Cabazon, CA
  14. 1.8 9km NE of Cabazon, CA
  15. 2.1 3km SE 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 130 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.