QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

1km SSW of Hermosa Beach, CA

· 14 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 41 kmOrange County 61 kmVentura County 88 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
14 km below the surface
Felt
35 reports · strongest reported intensity IV
Nearest
Los Angeles County, 41 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1385 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 35 people have reported feeling it to USGS.

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 33.8510, -118.4052. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 41 km (25 mi) SSW of here earthquakes near Los Angeles County
Orange County, CA 61 km (38 mi) WNW of here earthquakes near Orange County
Ventura County, CA 88 km (54 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. 1.8 14km NNE of Avalon, CA
  2. 1.8 3km ESE of Fountain Valley, CA
  3. 1.5 1km WSW of Baldwin Hills, CA
  4. 1.7 1km WNW of Las Flores, CA
  5. 3.3 2km WNW of Las Flores, CA
  6. 2.1 1km NW of Hermosa Beach, CA
  7. 1.7 1km NNE of Carson, CA
  8. 2.3 31km S of Malibu, CA
  9. 1.7 9km SSE of Malibu Beach, CA
  10. 1.9 4km E of View Park-Windsor Hills, CA
  11. 1.6 5km NW of Florence-Graham, CA
  12. 2.5 17km WSW of El Segundo, CA
  13. 1.5 6km SSW of Malibu, CA
  14. 1.5 2km ENE of Carson, CA
  15. 1.8 0km NE of Lennox, 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 4,600 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.