QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4km NNW of Wrightwood, CA

· 7.0 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 60 kmOrange County 81 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 1.8 (ml)
Depth
7.0 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Los Angeles County, 60 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1983 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 34.3933, -117.6568. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 60 km (37 mi) ENE of here earthquakes near Los Angeles County
Orange County, CA 81 km (50 mi) N of here earthquakes near Orange County
Kern County, CA 144 km (90 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

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

  1. 1.6 4km N of Rancho Cucamonga, CA
  2. 1.5 5km NNE of Fontana, CA
  3. 1.8 1km NNW of La Puente, CA
  4. 2.5 3km WSW of Fontana, CA
  5. 1.6 5km WNW of Muscoy, CA
  6. 1.6 2km ENE of Colton, CA
  7. 2.5 4km SE of Ontario, CA
  8. 2.0 9km WSW of Lytle Creek, CA
  9. 1.5 7km NW of Rancho Cucamonga, CA
  10. 1.5 5km NW of Fontana, CA
  11. 1.8 5km NNW of Fontana, CA
  12. 1.9 6km SW of Fontana, CA
  13. 1.9 6km S of Lytle Creek, CA
  14. 1.7 5km SW of Fontana, CA
  15. 3.4 4km NNW of Fontana, 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 7,900 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.