QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1mw

10 km SW of Corona, CA

· 4.6 km deep · released about 22 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 19 kmLos Angeles County 71 kmSan Diego County 119 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 4.1 (mw)
Depth
4.6 km below the surface
Felt
8407 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Orange County, 19 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 163 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 8407 people have reported feeling it to USGS.

How big was it?

This earthquake released about 22 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 7,700× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 340× the energy of this one
  3. Magna, Utah 2020 M 5.7 240× the energy of this one
  4. This earthquake M 4.1 about 22 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 46× more

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 33.8112, -117.6445. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 19 km (12 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 71 km (44 mi) SE of here earthquakes near Los Angeles County
San Diego County, CA 119 km (74 mi) NW of here earthquakes near San Diego County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.5 4 km SSW of Westminster, CA
  2. 1.5 6 km NW of Mira Loma, CA
  3. 1.7 8 km WSW of Calimesa, CA
  4. 1.7 2 km NE of Newport Beach, CA
  5. 2.2 7 km SSE of Loma Linda, CA
  6. 1.8 4 km SE of Loma Linda, CA
  7. 1.8 5 km SSW of Redlands, CA
  8. 1.7 5 km SSW of Redlands, CA
  9. 1.6 5 km SSW of Redlands, CA
  10. 1.6 5 km SSW of Redlands, CA
  11. 1.7 4 km SE of Loma Linda, CA
  12. 1.7 3 km SSE of Costa Mesa, CA
  13. 3.4 3 km ENE of Newport Beach, CA
  14. 3.6 2 km NE of Newport Beach, CA
  15. 2.8 3 km NE of Newport Beach, 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 4.4 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.