QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4mw

10km N of Big Bear City, CA

· 7.8 km deep · released about 2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Bernardino County 81 kmRiverside County 103 kmOrange County 116 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 3.4 (mw)
Depth
7.8 km below the surface
Felt
90 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
San Bernardino County, 81 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2005 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 90 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 83,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,600× the energy of this one
  4. This earthquake M 3.4 about 2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.3× 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 34.3542, -116.8267. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Bernardino County, CA 81 km (51 mi) SW of here earthquakes near San Bernardino County
Riverside County, CA 103 km (64 mi) NW of here earthquakes near Riverside County
Orange County, CA 116 km (72 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

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

  1. 2.5 18km N of Banning, CA
  2. 1.6 17km NNW of Morongo Valley, CA
  3. 1.5 22km N of Yucca Valley, CA
  4. 1.9 12km WSW of Morongo Valley, CA
  5. 1.7 30km WSW of Ludlow, CA
  6. 1.5 10km NE of Running Springs, CA
  7. 2.0 13km WNW of Morongo Valley, CA
  8. 1.7 13km WNW of Morongo Valley, CA
  9. 3.5 13km WNW of Morongo Valley, CA
  10. 1.6 12km E of Yucaipa, CA
  11. 1.8 10km NNW of Cabazon, CA
  12. 1.6 1km ENE of Redlands, CA
  13. 1.5 4km S of Redlands, CA
  14. 1.6 12km ESE of Big Bear City, CA
  15. 1.5 3km WSW 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 40 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.