QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5ml

4km ENE of Calimesa, CA

· 16 km deep · released about 2.5 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 79 kmRiverside County 98 kmSan Diego County 111 kmLos Angeles County 117 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 (ml)
Depth
16 km below the surface
Felt
198 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Orange County, 79 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2844 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 198 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2.5 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 68,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,100× the energy of this one
  4. This earthquake M 3.5 about 2.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 5.2× 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 34.0013, -117.0173. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 79 km (49 mi) ENE of here earthquakes near Orange County
Riverside County, CA 98 km (61 mi) WNW of here earthquakes near Riverside County
San Diego County, CA 111 km (69 mi) NNW of here earthquakes near San Diego County
Los Angeles County, CA 117 km (72 mi) E of here earthquakes near Los Angeles County
San Bernardino County, CA 122 km (76 mi) SW 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

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

  1. 1.6 6km WSW of Devore, CA
  2. 1.8 4km SE of Home Gardens, CA
  3. 2.5 3km SW of Morongo Valley, CA
  4. 2.0 2km ESE of Loma Linda, CA
  5. 2.0 8km SE of Valle Vista, CA
  6. 2.1 8km NNE of Beaumont, CA
  7. 1.6 8km NNE of Beaumont, CA
  8. 1.8 11km NNE of Running Springs, CA
  9. 1.5 8km NNE of Beaumont, CA
  10. 1.6 7km SE of Home Gardens, CA
  11. 2.1 8km NNE of Beaumont, CA
  12. 1.8 14km N of Cabazon, CA
  13. 1.7 14km SSE of Big Bear Lake, CA
  14. 1.8 9km NNW of Banning, CA
  15. 1.9 9km SE of Valle Vista, 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 33 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.