QuakeIndex

quarry blast · reviewed by a seismologist

M 2.1ml

7km NE of San Pedro, CA

· -0.1 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 44 kmLos Angeles County 47 kmVentura County 105 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 2.1 (ml)
Depth
-0.1 km below the surface
Felt
no reports yet
Nearest
Orange County, 44 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2896 days ago

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

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 33.7760, -118.2383. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 44 km (27 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 105 km (65 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

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

  1. 3.1 3km NNE of Yorba Linda, CA
  2. 1.6 11km WSW of Newport Beach, CA
  3. 1.6 4km NNW of Signal Hill, CA
  4. 1.6 15km S of Las Flores, CA
  5. 1.6 2km NNW of Willowbrook, CA
  6. 1.5 2km NE of Whittier, CA
  7. 1.8 1km E of Baldwin Hills, CA
  8. 1.8 2km W of El Segundo, CA
  9. 1.9 1km N of Lawndale, CA
  10. 2.0 4km SSW of La Mirada, CA
  11. 2.3 3km SW of La Mirada, CA
  12. 1.6 4km SW of Baldwin Hills, CA
  13. 1.6 9km WSW of Hermosa Beach, CA
  14. 1.6 7km SE of San Pedro, CA
  15. 2.4 16km NNE of Avalon, 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.