QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

7km WSW of Big Bear Lake, CA

· 8.0 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 96 kmSan Bernardino County 101 kmRiverside County 106 kmLos Angeles County 117 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 2.7 (ml)
Depth
8.0 km below the surface
Felt
11 reports · strongest reported intensity IV
Nearest
Orange County, 96 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1317 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 11 people have reported feeling it to USGS.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 34.2302, -116.9858. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 96 km (59 mi) NE of here earthquakes near Orange County
San Bernardino County, CA 101 km (63 mi) SW of here earthquakes near San Bernardino County
Riverside County, CA 106 km (66 mi) WNW of here earthquakes near Riverside County
Los Angeles County, CA 117 km (73 mi) E of here earthquakes near Los Angeles 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. 1.7 16km N of Yucca Valley, CA
  2. 1.6 6km ENE of Moreno Valley, CA
  3. 1.7 23km N of Yucca Valley, CA
  4. 1.6 10km W of Big Bear Lake, CA
  5. 1.6 3km NNW of Fontana, CA
  6. 2.2 8km ENE of Cabazon, CA
  7. 1.8 12km NNE of Cabazon, CA
  8. 1.8 13km NE of Running Springs, CA
  9. 1.6 4km NNW of Fontana, CA
  10. 1.6 1km E of Loma Linda, CA
  11. 1.6 3km NNW of Fontana, CA
  12. 1.7 15km ENE of Yucaipa, CA
  13. 1.8 5km SW of Devore, CA
  14. 2.8 2km SW of Redlands, CA
  15. 2.1 2km SW of Redlands, 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 480 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.