QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

10km SE of Running Springs, CA

· 9.7 km deep · released about 2.2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 84 kmRiverside County 106 kmLos Angeles County 112 kmSan Bernardino County 113 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 (ml)
Depth
9.7 km below the surface
Felt
525 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
Nearest
Orange County, 84 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3428 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 525 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2.2 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 78,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,500× the energy of this one
  4. This earthquake M 3.4 about 2.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.6× 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 34.1305, -117.0460. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 84 km (52 mi) NE of here earthquakes near Orange County
Riverside County, CA 106 km (66 mi) WNW of here earthquakes near Riverside County
Los Angeles County, CA 112 km (70 mi) E of here earthquakes near Los Angeles County
San Bernardino County, CA 113 km (70 mi) SW of here earthquakes near San Bernardino County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.1 6km N of Lytle Creek, CA
  2. 1.5 2km NNE of Colton, CA
  3. 1.6 3km NNE of Colton, CA
  4. 1.8 2km NNW of San Bernardino, CA
  5. 2.2 1km NNW of Lake Arrowhead, CA
  6. 1.8 6km E of Calimesa, CA
  7. 1.5 10km NNW of Banning, CA
  8. 1.6 5km NW of Idyllwild, CA
  9. 3.0 5km SE of Lytle Creek, CA
  10. 2.5 6km S of Redlands, CA
  11. 1.6 11km SSW of Big Bear Lake, CA
  12. 1.6 4km WNW of Cabazon, CA
  13. 2.7 2km ESE of Loma Linda, CA
  14. 2.7 4km WNW of Cabazon, CA
  15. 2.4 2km SE of Loma Linda, 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 27 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.