QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

9km N of Rancho Cucamonga, CA

· 9.5 km deep · released about 150 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 61 kmLos Angeles County 61 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 2.5 (ml)
Depth
9.5 km below the surface
Felt
70 reports · strongest reported intensity III
Nearest
Orange County, 61 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1667 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 70 people have reported feeling it to USGS.

How big was it?

This earthquake released about 150 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 99,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 70,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.2× the energy of this one
  4. This earthquake M 2.5 about 150 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 34.2053, -117.5950. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 61 km (38 mi) NNE of here earthquakes near Orange County
Los Angeles County, CA 61 km (38 mi) E of here earthquakes near Los Angeles County

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

Aftershocks so far

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

  1. 1.5 5km SSE of Home Gardens, CA
  2. 1.8 2km NW of Loma Linda, CA
  3. 1.9 3km NE of Yorba Linda, CA
  4. 1.6 2km NNW of Loma Linda, CA
  5. 1.8 4km SE of Home Gardens, CA
  6. 1.5 2km S of Devore, CA
  7. 1.6 5km SSE of Home Gardens, CA
  8. 3.3 6km E of Ontario, CA
  9. 1.7 7km SSE of Redlands, CA
  10. 1.6 2km SE of Loma Linda, CA
  11. 1.5 6km NE of Running Springs, CA
  12. 2.8 7km S of Redlands, CA
  13. 1.6 5km SE of Home Gardens, CA
  14. 1.8 4km SE of Redlands, CA
  15. 1.7 4km SE of Redlands, 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 1,300 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.