QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

2km E of Loma Linda, CA

· 15 km deep · released about 700 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 64 kmLos Angeles County 95 kmRiverside 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
15 km below the surface
Felt
47 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Orange County, 64 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2059 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 47 people have reported feeling it to USGS.

How big was it?

This earthquake released about 700 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 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 15,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 700 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 34.0465, -117.2418. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 64 km (40 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 95 km (59 mi) E of here earthquakes near Los Angeles County
Riverside County, CA 120 km (74 mi) WNW of here earthquakes near Riverside County
San Diego County, CA 122 km (76 mi) NNW of here earthquakes near San Diego County
San Bernardino County, CA 133 km (82 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. 1.8 3km NNW of Loma Linda, CA
  2. 1.9 4km WNW of Yucaipa, CA
  3. 2.0 4km ESE of Mentone, CA
  4. 1.6 6km SSE of Loma Linda, CA
  5. 1.7 7km SSW of Cabazon, CA
  6. 1.9 5km SSW of Redlands, CA
  7. 2.4 5km SSW of Redlands, CA
  8. 1.6 2km WNW of Beaumont, CA
  9. 1.6 4km NNE of Banning, CA
  10. 1.7 4km SSW of Calimesa, CA
  11. 2.1 5km W of Devore, CA
  12. 2.0 8km E of Yorba Linda, CA
  13. 2.2 6km NE of Running Springs, CA
  14. 1.6 6km NE of Running Springs, CA
  15. 1.7 3km SE 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 230 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.