QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5mw

13km WNW of Morongo Valley, CA

· 5.3 km deep · released about 2.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 76 kmSan Bernardino County 100 kmOrange County 107 kmSan Diego County 117 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 3.5 (mw)
Depth
5.3 km below the surface
Felt
103 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Riverside County, 76 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2069 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 103 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 70,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,200× the energy of this one
  4. This earthquake M 3.5 about 2.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 5.1× 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 34.0712, -116.7215. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 76 km (48 mi) WNW of here earthquakes near Riverside County
San Bernardino County, CA 100 km (62 mi) SSW of here earthquakes near San Bernardino County
Orange County, CA 107 km (66 mi) ENE of here earthquakes near Orange County
San Diego County, CA 117 km (72 mi) N of here earthquakes near San Diego County

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

Aftershocks so far

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

  1. 1.7 7km SSW of Cabazon, CA
  2. 1.9 5km SSW of Redlands, CA
  3. 2.4 5km SSW of Redlands, CA
  4. 1.6 2km WNW of Beaumont, CA
  5. 1.6 4km NNE of Banning, CA
  6. 1.7 4km SSW of Calimesa, CA
  7. 2.2 6km NE of Running Springs, CA
  8. 2.2 4km SSW of Idyllwild, CA
  9. 2.4 11km SW of Morongo Valley, CA
  10. 1.6 6km NE of Running Springs, CA
  11. 1.7 3km SE of Yucaipa, CA
  12. 1.7 2km ESE of Redlands, CA
  13. 1.9 9km WSW of Beaumont, CA
  14. 1.5 8km S of Beaumont, CA
  15. 1.6 7km S 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 34 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.