QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

1km NNW of Florence-Graham, CA

· 17 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 24 kmOrange County 55 kmVentura County 92 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
17 km below the surface
Felt
no reports yet
Nearest
Los Angeles County, 24 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3258 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 5.9 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 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 33.9780, -118.2490. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 24 km (15 mi) S of here earthquakes near Los Angeles County
Orange County, CA 55 km (34 mi) NW of here earthquakes near Orange County
Ventura County, CA 92 km (57 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

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

  1. 1.6 1km E of Yorba Linda, CA
  2. 1.7 4km WNW of San Fernando, CA
  3. 2.0 1km WSW of Manhattan Beach, CA
  4. 1.8 3 km NE of Malibu, California
  5. 2.3 1km WSW of Manhattan Beach, CA
  6. 1.9 2km WSW of Manhattan Beach, CA
  7. 1.8 2km WSW of Manhattan Beach, CA
  8. 2.3 1km WSW of Manhattan Beach, CA
  9. 2.1 3km SSE of Huntington Beach, CA
  10. 1.6 1km SSE of Silver Lake, CA
  11. 2.2 0km ESE of Silver Lake, CA
  12. 2.0 8km SSW of Huntington Beach, CA
  13. 1.6 12km SSW of Agua Dulce, CA
  14. 2.9 1km SE of Silver Lake, CA
  15. 2.4 12km SSW of Agua Dulce, 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.