QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

4km N of La Verne, CA

· 4.4 km deep · released about 1.8 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 46 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 3.4 (ml)
Depth
4.4 km below the surface
Felt
134 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
Nearest
Los Angeles County, 46 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2881 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 134 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 92,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,900× the energy of this one
  4. This earthquake M 3.4 about 1.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.8× 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 34.1350, -117.7710. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 46 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

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

  1. 1.7 3km SE of Lytle Creek, CA
  2. 1.5 6km SSW of Lytle Creek, CA
  3. 1.5 4km NNW of La Verne, CA
  4. 1.6 6km WSW of Devore, CA
  5. 1.8 4km SE of Home Gardens, CA
  6. 2.0 2km ESE of Loma Linda, CA
  7. 1.6 7km SE of Home Gardens, CA
  8. 1.7 4km N of La Verne, CA
  9. 1.6 7km NW of Rancho Cucamonga, CA
  10. 1.5 4km SE of Home Gardens, CA
  11. 1.9 7km S of Lytle Creek, CA
  12. 1.6 0km SSW of Loma Linda, CA
  13. 2.1 4km ENE of Lytle Creek, CA
  14. 2.9 4km N of La Verne, CA
  15. 1.6 1km ESE of Maywood, 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 31 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.