QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

5km N of Big Bear Lake, CA

· 9.0 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Bernardino County 92 kmOrange County 104 kmRiverside 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 2.7 (ml)
Depth
9.0 km below the surface
Felt
14 reports · strongest reported intensity III
Nearest
San Bernardino County, 92 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 712 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 14 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 34.2895, -116.9195. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Bernardino County, CA 92 km (57 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 105 km (65 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

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

  1. 1.7 10km NE of Big Bear City, CA
  2. 1.6 10km NE of Big Bear City, CA
  3. 2.3 5km SE of Loma Linda, CA
  4. 1.5 40km WSW of Ludlow, CA
  5. 2.9 10km NE of Big Bear City, CA
  6. 1.7 10km NE of Big Bear City, CA
  7. 2.4 10km NE of Big Bear City, CA
  8. 1.8 3km SE of Loma Linda, CA
  9. 1.8 16 km NNE of Apple Valley, CA
  10. 1.9 8km NE of Cabazon, CA
  11. 2.1 6km NNW of Big Bear Lake, CA
  12. 1.7 3km SSW of Big Bear City, CA
  13. 1.7 2km WNW of Muscoy, CA
  14. 1.6 2km S of Highland, CA
  15. 1.8 11km NNW of Big Bear Lake, 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.