QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

3km SSW of Signal Hill, CA

· 12 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 40 kmLos Angeles County 47 kmVentura County 108 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 1.5 (ml)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Orange County, 40 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3685 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 33.7810, -118.1860. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 40 km (25 mi) WNW of here earthquakes near Orange County
Los Angeles County, CA 47 km (29 mi) S of here earthquakes near Los Angeles County
Ventura County, CA 108 km (67 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

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

  1. 2.2 2km ENE of Inglewood, CA
  2. 2.8 30km WSW of Rancho Palos Verdes, CA
  3. 2.4 1km ENE of Brea, CA
  4. 1.7 7km WSW of Huntington Beach, CA
  5. 1.6 2km N of Costa Mesa, CA
  6. 2.1 7km WSW of Huntington Beach, CA
  7. 1.8 18km SSW of Rancho Palos Verdes, CA
  8. 2.6 31km WSW of Rancho Palos Verdes, CA
  9. 2.1 7km WSW of Santa Monica, CA
  10. 1.9 19km S of Malibu Beach, CA
  11. 1.7 6km SW of Chino Hills, CA
  12. 1.6 4km N of Yorba Linda, CA
  13. 2.3 14km SSE of Malibu Beach, CA
  14. 1.6 4km WSW of Compton, CA
  15. 2.5 2km NNE of Costa Mesa, 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.