QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

2km N of Yucaipa, CA

· 11 km deep · released about 750 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 79 kmRiverside County 103 kmLos Angeles County 113 kmSan Diego County 117 kmSan Bernardino County 120 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 2.9 (ml)
Depth
11 km below the surface
Felt
37 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Orange County, 79 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1595 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 37 people have reported feeling it to USGS.

How big was it?

This earthquake released about 750 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 20,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 14,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.3× the energy of this one
  4. This earthquake M 2.9 about 750 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 34.0473, -117.0453. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 79 km (49 mi) ENE of here earthquakes near Orange County
Riverside County, CA 103 km (64 mi) WNW of here earthquakes near Riverside County
Los Angeles County, CA 113 km (70 mi) E of here earthquakes near Los Angeles County
San Diego County, CA 117 km (72 mi) NNW of here earthquakes near San Diego County
San Bernardino County, CA 120 km (74 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

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

  1. 1.7 4km NNW of Fontana, CA
  2. 2.0 10km NNW of Idyllwild, CA
  3. 2.1 2km S of Devore, CA
  4. 1.9 2km S of Devore, CA
  5. 2.6 4km NNW of Fontana, CA
  6. 2.0 4km NW of Fontana, CA
  7. 2.4 5km SSW of Redlands, CA
  8. 2.0 4km SE of Home Gardens, CA
  9. 2.5 10km NW of San Jacinto, CA
  10. 1.9 13km NW of Big Bear Lake, CA
  11. 1.5 4km SSE of Rancho Cucamonga, CA
  12. 1.7 7km SSE of Home Gardens, CA
  13. 1.7 10km SSE of Cabazon, CA
  14. 2.0 4km WNW of Garnet, CA
  15. 1.6 1km W of Yucaipa, 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 220 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.