QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

4km N of La Verne, CA

· 5.8 km deep · released about 750 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 45 kmOrange County 51 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
5.8 km below the surface
Felt
233 reports · strongest reported intensity III
Measured shaking
intensity V (ShakeMap)
Nearest
Los Angeles County, 45 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2817 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 233 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 34.1358, -117.7738. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 45 km (28 mi) E of here earthquakes near Los Angeles County
Orange County, CA 51 km (32 mi) N of here earthquakes near Orange County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 3.1 2km SSW of Norwalk, CA
  2. 1.8 2km SSW of Loma Linda, CA
  3. 1.5 3km SW of San Bernardino, CA
  4. 2.2 5km N of Glen Avon, CA
  5. 2.6 3km NNW of Fontana, CA
  6. 1.7 2km SSE of Loma Linda, CA
  7. 1.7 4km E of Brea, CA
  8. 1.6 5km SSE of Home Gardens, CA
  9. 1.7 3km SW of San Bernardino, CA
  10. 2.4 3km SW of San Bernardino, CA
  11. 2.3 6km SSW of Pearblossum, CA
  12. 3.1 3km NNE of Yorba Linda, CA
  13. 1.7 5km SSE of Home Gardens, CA
  14. 1.9 5km S of Rancho Cucamonga, CA
  15. 2.5 3km N of Muscoy, 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 4.4 on 2018-08-29 — it released about 150 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.