QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

7km S of Big Bear City, CA

· 7.0 km deep · released about 1,200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 93 kmSan Bernardino County 94 kmOrange County 105 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
7.0 km below the surface
Felt
10 reports · strongest reported intensity IV
Nearest
Riverside County, 93 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1564 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 10 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,200 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 6.7 280,000× 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 8,800× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× 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 34.2022, -116.8313. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 93 km (58 mi) NW of here earthquakes near Riverside County
San Bernardino County, CA 94 km (58 mi) SW of here earthquakes near San Bernardino County
Orange County, CA 105 km (65 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

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

  1. 1.6 8km NE of Nuevo, CA
  2. 1.6 11km E of Yucaipa, CA
  3. 2.0 1km ESE of Loma Linda, CA
  4. 1.7 10km WNW of Big Bear Lake, CA
  5. 2.0 4km N of Cabazon, CA
  6. 1.7 3km ENE of Colton, CA
  7. 1.5 8km SE of Big Bear City, CA
  8. 1.7 2km NNW of Loma Linda, CA
  9. 1.9 9km NNE of Nuevo, CA
  10. 2.3 2km SE of Loma Linda, CA
  11. 1.8 14km S of Big Bear Lake, CA
  12. 1.6 10km NNW of Big Bear Lake, CA
  13. 1.6 15km WNW of Morongo Valley, CA
  14. 1.6 11km SSW of Lucerne Valley, CA
  15. 2.6 12km SSE of Big Bear City, 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 95 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.