QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

1km NNW of La Puente, CA

· 9.3 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 34 kmOrange County 42 kmVentura County 114 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
9.3 km below the surface
Felt
no reports yet
Nearest
Los Angeles County, 34 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1867 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 34.0282, -117.9543. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 34 km (21 mi) ESE of here earthquakes near Los Angeles County
Orange County, CA 42 km (26 mi) NNW of here earthquakes near Orange County
Ventura County, CA 114 km (71 mi) ESE of here earthquakes near Ventura County
San Diego County, CA 156 km (97 mi) NW of here earthquakes near San Diego 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 4km WSW of East Los Angeles, CA
  2. 1.5 4km SE of Home Gardens, CA
  3. 1.6 2km SSW of Sherman Oaks, CA
  4. 1.6 2km ESE of Anaheim, CA
  5. 1.6 2km ESE of Anaheim, CA
  6. 1.6 2km ESE of Lawndale, CA
  7. 1.5 5km SE of Home Gardens, CA
  8. 1.6 5km NNE of Fontana, CA
  9. 2.0 3km WSW of East Los Angeles, CA
  10. 3.6 3km WSW of East Los Angeles, CA
  11. 2.0 4km SE of Home Gardens, CA
  12. 2.4 1km NW of View Park-Windsor Hills, CA
  13. 1.9 3km WNW of Fontana, CA
  14. 1.8 1km S of Commerce, CA
  15. 1.5 4km NW 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 4.5 on 2020-09-19 — it released about 13,000 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.