QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

5km WSW of Morongo Valley, CA

· 10 km deep · released about 450 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 68 kmSan Bernardino County 100 kmOrange County 113 kmSan Diego 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 2.8 (ml)
Depth
10 km below the surface
Felt
22 reports · strongest reported intensity III
Nearest
Riverside County, 68 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1905 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 22 people have reported feeling it to USGS.

How big was it?

This earthquake released about 450 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 34,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 24,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.1× the energy of this one
  4. This earthquake M 2.8 about 450 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 34.0363, -116.6355. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 68 km (42 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 113 km (70 mi) ENE of here earthquakes near Orange County
San Diego County, CA 113 km (70 mi) N of here earthquakes near San Diego County
Imperial County, CA 162 km (101 mi) NW of here earthquakes near Imperial County

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

Aftershocks so far

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

  1. 2.0 5km N of Running Springs, CA
  2. 3.0 5km NNE of Running Springs, CA
  3. 1.7 10km S of Idyllwild, CA
  4. 1.6 7km SW of Morongo Valley, CA
  5. 1.6 4km NNW of Yucca Valley, CA
  6. 3.6 4km NNW of Yucca Valley, CA
  7. 2.3 5km S of Mentone, CA
  8. 1.6 4km ENE of Big Bear City, CA
  9. 1.5 12km N of Big Bear City, CA
  10. 2.6 12km N of Big Bear City, CA
  11. 1.7 6km NNE of Big Bear City, CA
  12. 1.6 10km N of Big Bear Lake, CA
  13. 1.5 3km ENE of Big Bear City, CA
  14. 2.0 5km ESE of Yucaipa, CA
  15. 2.6 3km ENE of San Jacinto, 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 370 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.