QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5mw

10km NNW of Idyllwild, CA

· 12 km deep · released about 2.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 70 kmSan Diego County 89 kmOrange County 96 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 3.5 (mw)
Depth
12 km below the surface
Felt
606 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
Nearest
Riverside County, 70 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1432 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 606 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 75,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,400× the energy of this one
  4. This earthquake M 3.5 about 2.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.7× more

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 33.8255, -116.7507. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 70 km (43 mi) W of here earthquakes near Riverside County
San Diego County, CA 89 km (55 mi) N of here earthquakes near San Diego County
Orange County, CA 96 km (60 mi) E of here earthquakes near Orange County
San Bernardino County, CA 126 km (78 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

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

  1. 1.5 4km ENE of Beaumont, CA
  2. 2.1 1km ENE of Yucaipa, CA
  3. 2.0 16km ESE of Anza, CA
  4. 2.3 8km NE of Cabazon, CA
  5. 2.0 23km ESE of Anza, CA
  6. 1.5 3km ESE of Loma Linda, CA
  7. 1.6 4km NE of Banning, CA
  8. 1.8 5km ENE of Beaumont, CA
  9. 1.8 2km WNW of Valle Vista, CA
  10. 1.7 11km ENE of Aguanga, CA
  11. 1.6 18km ESE of Anza, CA
  12. 2.6 2km S of Redlands, CA
  13. 1.5 4km SSW of Redlands, CA
  14. 1.9 11km NNW of Anza, CA
  15. 2.0 18km NNW of Morongo Valley, 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 4.9 on 2020-04-04 — it released about 130 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.