QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

18km SSE of Big Bear Lake, CA

· 1.9 km deep · released about 1,500 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 88 kmOrange County 97 kmSan Bernardino County 105 kmSan Diego County 119 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
1.9 km below the surface
Felt
45 reports · strongest reported intensity III
Nearest
Riverside County, 88 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2140 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 45 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,500 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 6.7 220,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,900× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× 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 34.0878, -116.8537. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 88 km (55 mi) WNW of here earthquakes near Riverside County
Orange County, CA 97 km (60 mi) ENE of here earthquakes near Orange County
San Bernardino County, CA 105 km (65 mi) SW of here earthquakes near San Bernardino County
San Diego County, CA 119 km (74 mi) N of here earthquakes near San Diego County

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

Aftershocks so far

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

  1. 1.6 2km W of Calimesa, CA
  2. 2.9 13km NW of Morongo Valley, CA
  3. 2.4 10km ESE of Big Bear City, CA
  4. 1.8 6km SSW of Calimesa, CA
  5. 2.1 5km NNE of Banning, CA
  6. 1.6 10km SSW of Calimesa, CA
  7. 1.5 4km SW of Redlands, CA
  8. 2.1 18km SSE of Big Bear Lake, CA
  9. 1.6 8km SSW of Idyllwild, CA
  10. 1.6 4km SW of Redlands, CA
  11. 1.5 13km NNE of Yucaipa, CA
  12. 1.9 10km NNE of Cabazon, CA
  13. 2.1 6km SW of Idyllwild, CA
  14. 1.8 8km N of Big Bear City, CA
  15. 1.9 7km N of Valle Vista, 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 110 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.