QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

4 km SSE of Highland Park, CA

· 10 km deep · released about 510 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 14 kmOrange County 59 kmVentura County 93 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
10 km below the surface
Felt
597 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Los Angeles County, 14 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 480 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 597 people have reported feeling it to USGS.

How big was it?

This earthquake released about 510 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 30,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 21,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.9× the energy of this one
  4. This earthquake M 2.8 about 510 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 34.0852, -118.1802. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 14 km (9 mi) SSE of here earthquakes near Los Angeles County
Orange County, CA 59 km (37 mi) NW of here earthquakes near Orange County
Ventura County, CA 93 km (58 mi) ESE of here earthquakes near Ventura County

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

Aftershocks so far

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

  1. 1.5 7 km SSE of Pearblossom, CA
  2. 1.8 5 km SSW of South Pasadena, CA
  3. 2.1 4 km S of Long Beach, CA
  4. 1.6 4 km S of Highland Park, CA
  5. 1.5 7 km SSE of Pearblossom, CA
  6. 1.8 1 km NW of View Park-Windsor Hills, CA
  7. 2.1 4 km S of Highland Park, CA
  8. 1.5 4 km SSE of Highland Park, CA
  9. 2.3 4 km SSE of Highland Park, CA
  10. 1.9 4 km S of Highland Park, CA
  11. 1.5 4 km SSE of Highland Park, CA
  12. 1.6 4 km SSE of Highland Park, CA
  13. 1.5 4 km S of Highland Park, CA
  14. 1.5 4 km SSE of Highland Park, CA
  15. 1.6 4 km SSE of Highland Park, 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 380 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.