QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

11km SW of Morongo Valley, CA

· 15 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 68 kmSan Bernardino County 107 kmSan Diego County 107 kmOrange County 108 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 2.4 (ml)
Depth
15 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Riverside County, 68 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2077 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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 33.9838, -116.6738. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 68 km (42 mi) WNW of here earthquakes near Riverside County
San Bernardino County, CA 107 km (67 mi) SSW of here earthquakes near San Bernardino County
San Diego County, CA 107 km (67 mi) N of here earthquakes near San Diego County
Orange County, CA 108 km (67 mi) ENE of here earthquakes near Orange County

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

Aftershocks so far

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

  1. 2.9 9km N of Big Bear Lake, CA
  2. 1.5 9km N of Big Bear Lake, CA
  3. 1.7 9km N of Big Bear Lake, CA
  4. 1.5 10km NNE of Banning, CA
  5. 1.8 11km S of Idyllwild, CA
  6. 1.6 12km ENE of Desert Hot Springs, CA
  7. 1.8 17km SE of Big Bear City, CA
  8. 2.1 13km NNE of Cabazon, CA
  9. 1.8 26km N of Yucca Valley, CA
  10. 1.8 26km N of Yucca Valley, CA
  11. 2.2 25km N of Yucca Valley, CA
  12. 3.2 9km NNW of Cabazon, CA
  13. 1.9 17km SE of Big Bear City, CA
  14. 1.6 17km SE of Big Bear City, CA
  15. 1.6 17km SE 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 1,400 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.