QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

9km NNW of Big Bear City, CA

· 2.7 km deep · released about 46 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Bernardino County 85 kmRiverside County 104 kmOrange County 112 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
2.7 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
San Bernardino County, 85 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3258 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 46 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 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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 34.3363, -116.8647. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Bernardino County, CA 85 km (53 mi) SW of here earthquakes near San Bernardino County
Riverside County, CA 104 km (65 mi) NW of here earthquakes near Riverside County
Orange County, CA 112 km (69 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

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

  1. 2.6 3km SE of Loma Linda, CA
  2. 1.6 3km ESE of Loma Linda, CA
  3. 2.7 5km E of Calimesa, CA
  4. 2.7 2km ESE of Loma Linda, CA
  5. 1.5 3km ESE of Loma Linda, CA
  6. 1.5 6km N of Big Bear City, CA
  7. 2.2 4km SE of Yucaipa, CA
  8. 1.7 14km SW of Lucerne Valley, CA
  9. 1.7 2km SSE of Muscoy, CA
  10. 1.6 2km ESE of Loma Linda, CA
  11. 2.1 2km NNE of Loma Linda, CA
  12. 1.6 5km SSW of Redlands, CA
  13. 2.1 2km SE of Loma Linda, CA
  14. 2.6 3km SE of Loma Linda, CA
  15. 2.6 6km ENE of Lake Arrowhead, 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 2,500 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.