QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

9km S of Seal Beach, CA

· 15 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 29 kmLos Angeles County 61 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
15 km below the surface
Felt
no reports yet
Nearest
Orange County, 29 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3187 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 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 33.6637, -118.0947. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 29 km (18 mi) W of here earthquakes near Orange County
Los Angeles County, CA 61 km (38 mi) SSE of here earthquakes near Los Angeles County
Ventura County, CA 123 km (76 mi) SE 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. 2.0 4km SSW of Baldwin Hills, CA
  2. 1.7 2km E of Foothill Ranch, CA
  3. 1.8 4km WSW of Irvine, CA
  4. 1.5 24km SW of Dana Point, CA
  5. 1.8 1km NNW of Rolling Hills Estates, CA
  6. 1.7 2km SSW of Yorba Linda, CA
  7. 1.6 1km E of Baldwin Hills, CA
  8. 1.5 1km NE of Pico Rivera, CA
  9. 2.0 4km E of Lennox, CA
  10. 1.5 4km WNW of Willowbrook, CA
  11. 2.7 2km ENE of La Habra, CA
  12. 2.0 2km S of Newport Beach, CA
  13. 1.6 1km NNE of Huntington Park, CA
  14. 1.7 9km SW of Rancho Palos Verdes, CA
  15. 1.6 8km ESE of North Tustin, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.