QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

9km SW of Morongo Valley, CA

· 18 km deep · released about 6.2 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 65 kmSan Bernardino County 106 kmSan Diego County 107 kmOrange County 110 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 1.5 (ml)
Depth
18 km below the surface
Felt
no reports yet
Nearest
Riverside County, 65 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1337 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 6.2 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.5 about 6.2 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 33.9837, -116.6415. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 65 km (41 mi) WNW of here earthquakes near Riverside County
San Bernardino County, CA 106 km (66 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 110 km (69 mi) ENE of here earthquakes near Orange County
Imperial County, CA 159 km (99 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 14km W of Morongo Valley, CA
  2. 1.5 6km NE of Beaumont, CA
  3. 2.1 17km ENE of Big Bear City, CA
  4. 1.8 10km NW of San Jacinto, CA
  5. 1.9 9km WNW of Big Bear Lake, CA
  6. 1.6 8km ESE of Big Bear City, CA
  7. 1.7 3km SW of Calimesa, CA
  8. 1.8 3km SE of San Jacinto, CA
  9. 1.6 15km W of Morongo Valley, CA
  10. 3.1 5km SSW of Big Bear Lake, CA
  11. 1.9 8km WSW of Idyllwild, CA
  12. 1.5 3km NNW of Cabazon, CA
  13. 1.6 10km SSW of Joshua Tree, CA
  14. 2.6 5km S of Idyllwild, CA
  15. 2.0 10km SSW of Joshua Tree, 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 27,000 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.