QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

6km NNW of Big Bear Lake, CA

· 3.9 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Bernardino County 93 kmOrange County 104 kmRiverside County 107 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 2.1 (ml)
Depth
3.9 km below the surface
Felt
no reports yet
Nearest
San Bernardino County, 93 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2361 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 38 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 34.2990, -116.9335. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Bernardino County, CA 93 km (58 mi) SW of here earthquakes near San Bernardino County
Orange County, CA 104 km (65 mi) NE of here earthquakes near Orange County
Riverside County, CA 107 km (66 mi) NW of here earthquakes near Riverside 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. 2.0 3km ENE of Colton, CA
  2. 1.8 3 km ENE of Colton, CA
  3. 1.9 16 km N of Yucca Valley, CA
  4. 1.9 10 km NNW of Cabazon, CA
  5. 1.6 3 km W of Banning, CA
  6. 3.0 16km N of Yucca Valley, CA
  7. 1.7 6km SSW of Redlands, CA
  8. 1.7 2km SSE of Loma Linda, CA
  9. 2.3 31km N of Yucca Valley, CA
  10. 2.5 4km WSW of Banning, CA
  11. 1.6 1km ESE of Redlands, CA
  12. 1.7 7km NNE of Fontana, CA
  13. 1.7 18km N of Yucca Valley, CA
  14. 1.5 3km SSW of Running Springs, CA
  15. 2.4 5km NW 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 4.5 on 2018-05-08 — it released about 4,300 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.