QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

12km SW of Morongo Valley, CA

· 16 km deep · released about 700 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 69 kmOrange County 106 kmSan Diego County 107 kmSan Bernardino County 107 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 2.9 (ml)
Depth
16 km below the surface
Felt
55 reports · strongest reported intensity III
Nearest
Riverside County, 69 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2136 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 55 people have reported feeling it to USGS.

How big was it?

This earthquake released about 700 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 15,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 700 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 33.9853, -116.6868. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 69 km (43 mi) WNW of here earthquakes near Riverside County
Orange County, CA 106 km (66 mi) ENE of here earthquakes near Orange County
San Diego County, CA 107 km (67 mi) N of here earthquakes near San Diego County
San Bernardino County, CA 107 km (67 mi) SSW 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

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

  1. 2.3 7km S of Redlands, CA
  2. 1.6 1km ENE of Redlands, CA
  3. 1.5 12km ENE of Thousand Palms, CA
  4. 1.5 4km S of Redlands, CA
  5. 2.2 6km N of Valle Vista, CA
  6. 1.6 12km ESE of Big Bear City, CA
  7. 1.9 6km SSW of Idyllwild, CA
  8. 1.6 9km WSW of Idyllwild, CA
  9. 1.8 15km S of Joshua Tree, CA
  10. 1.5 3km WSW of Redlands, CA
  11. 1.6 21km N of Yucca Valley, CA
  12. 1.7 10km NNE of Cabazon, CA
  13. 1.6 2km W of Calimesa, CA
  14. 2.9 13km NW of Morongo Valley, CA
  15. 2.4 10km ESE 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 230 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.