QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

8km WSW of Corona, CA

· 9.8 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 22 kmLos Angeles County 68 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 1.9 (ml)
Depth
9.8 km below the surface
Felt
no reports yet
Nearest
Orange County, 22 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1424 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 33.8477, -117.6533. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 22 km (14 mi) NNE of here earthquakes near Orange County
Los Angeles County, CA 68 km (42 mi) SE of here earthquakes near Los Angeles County
San Diego County, CA 123 km (76 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

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

  1. 1.6 3km NNW of Fontana, CA
  2. 1.8 5km SW of Devore, CA
  3. 2.8 2km SW of Redlands, CA
  4. 2.1 2km SW of Redlands, CA
  5. 2.0 4km SE of Home Gardens, CA
  6. 1.6 3km SW of Yorba Linda, CA
  7. 1.6 2km ESE of Loma Linda, CA
  8. 1.6 2km ENE of La Habra, CA
  9. 1.5 2km SE of Loma Linda, CA
  10. 1.6 8km SSE of Home Gardens, CA
  11. 1.8 6km NNW of Mira Loma, CA
  12. 1.7 4km NW of Diamond Bar, CA
  13. 1.6 5km SE of Home Gardens, CA
  14. 2.0 6km N of Fontana, CA
  15. 1.9 10km WSW of Corona, 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 9,400 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.