QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4km S of Morongo Valley, CA

· 10 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 62 kmSan Bernardino County 101 kmSan Diego County 111 kmOrange County 116 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 1.8 (ml)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Riverside County, 62 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2566 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 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 34.0117, -116.5878. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 62 km (39 mi) WNW of here earthquakes near Riverside County
San Bernardino County, CA 101 km (63 mi) SSW of here earthquakes near San Bernardino County
San Diego County, CA 111 km (69 mi) N of here earthquakes near San Diego County
Orange County, CA 116 km (72 mi) ENE of here earthquakes near Orange County
Imperial County, CA 157 km (98 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

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

  1. 1.7 17km N of Indio, CA
  2. 3.1 17km N of Indio, CA
  3. 1.7 16 km N of Indio, CA
  4. 3.5 16km N of Indio, CA
  5. 1.6 16 km N of Indio, CA
  6. 1.6 6km E of Cabazon, CA
  7. 2.1 6km E of Cabazon, CA
  8. 3.4 6km E of Cabazon, CA
  9. 1.7 6km ENE of Running Springs, CA
  10. 2.5 6km SE of Big Bear Lake, CA
  11. 1.9 8km N of Anza, CA
  12. 1.5 5km NNE of Banning, CA
  13. 1.8 2km ESE of Beaumont, CA
  14. 1.7 19km ENE of Thousand Palms, CA
  15. 1.7 4km NE of Banning, 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 10,000 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.