QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

2km E of Wrightwood, CA

· 7.8 km deep · released about 450 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 62 kmOrange County 78 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
7.8 km below the surface
Felt
17 reports · strongest reported intensity IV
Nearest
Los Angeles County, 62 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1857 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 17 people have reported feeling it to USGS.

How big was it?

This earthquake released about 450 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 34,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 24,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.1× the energy of this one
  4. This earthquake M 2.8 about 450 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 34.3600, -117.6120. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 62 km (39 mi) ENE of here earthquakes near Los Angeles County
Orange County, CA 78 km (48 mi) NNE of here earthquakes near Orange County
Kern County, CA 150 km (93 mi) SE of here earthquakes near Kern County

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

Aftershocks so far

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

  1. 1.9 3km WNW of Fontana, CA
  2. 1.5 4km NW of Fontana, CA
  3. 1.9 3km NNW of Rancho Cucamonga, CA
  4. 1.8 5km NNW of Glen Avon, CA
  5. 2.3 9km N of Rancho Cucamonga, CA
  6. 2.0 9km SW of Lytle Creek, CA
  7. 1.8 6km WNW of Wrightwood, CA
  8. 1.6 4km SE of Rancho Cucamonga, CA
  9. 2.3 8km SSW of Pearblossom, CA
  10. 2.9 2km SSE of Lytle Creek, CA
  11. 2.6 3km NNW of La Verne, CA
  12. 1.6 5km NNE of Fontana, CA
  13. 2.6 5km NNE of Fontana, CA
  14. 1.6 4km SW of Highland, CA
  15. 2.0 3km E 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 4.4 on 2018-08-29 — it released about 250 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.