QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

6 km WNW of Calimesa, CA

· 18 km deep · released about 550 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 71 kmLos Angeles County 107 kmRiverside County 108 kmSan Diego County 114 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
18 km below the surface
Felt
86 reports · strongest reported intensity IV
Measured shaking
intensity II (ShakeMap)
Nearest
Orange County, 71 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 897 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 86 people have reported feeling it to USGS.

How big was it?

This earthquake released about 550 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 28,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 19,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.7× the energy of this one
  4. This earthquake M 2.8 about 550 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 34.0047, -117.1202. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 71 km (44 mi) ENE of here earthquakes near Orange County
Los Angeles County, CA 107 km (67 mi) E of here earthquakes near Los Angeles County
Riverside County, CA 108 km (67 mi) WNW of here earthquakes near Riverside County
San Diego County, CA 114 km (71 mi) NNW of here earthquakes near San Diego County
San Bernardino County, CA 128 km (80 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. 1.5 6 km SSW of Devore, CA
  2. 1.6 1 km S of Colton, CA
  3. 2.1 8 km N of Big Bear Lake, CA
  4. 1.9 10 km NNE of Yucaipa, CA
  5. 1.5 9 km W of Calimesa, CA
  6. 1.9 9 km W of Calimesa, CA
  7. 1.6 12 km W of Morongo Valley, CA
  8. 1.6 6 km E of Cabazon, CA
  9. 2.0 6 km SE of Valle Vista, CA
  10. 1.6 3 km SE of Yucaipa, CA
  11. 2.2 11 km NE of Cabazon, CA
  12. 1.6 6 km WSW of Idyllwild, CA
  13. 1.6 6 km N of Moreno Valley, CA
  14. 1.6 5 km SSE of Home Gardens, CA
  15. 2.4 2 km SSE of Loma Linda, 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 300 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.