QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

3km ENE of Upland, CA

· 14 km deep · released about 160 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 50 kmLos Angeles County 60 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
14 km below the surface
Felt
16 reports · strongest reported intensity III
Nearest
Orange County, 50 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2984 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 16 people have reported feeling it to USGS.

How big was it?

This earthquake released about 160 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 92,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 65,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.8× the energy of this one
  4. This earthquake M 2.5 about 160 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 34.1068, -117.6228. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 50 km (31 mi) NNE of here earthquakes near Orange County
Los Angeles County, CA 60 km (37 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

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

  1. 2.5 6km SW of Lytle Creek, CA
  2. 2.0 4km WNW of Muscoy, CA
  3. 1.7 6km NNW of Fontana, CA
  4. 2.2 8km ENE of Moreno Valley, CA
  5. 1.6 8km ENE of Moreno Valley, CA
  6. 2.7 2km ENE of La Habra, CA
  7. 2.0 5km ENE of Ontario, CA
  8. 2.2 5km SE of Loma Linda, CA
  9. 1.9 6km N of Moreno Valley, CA
  10. 1.7 8km S of Hesperia, CA
  11. 1.9 4km SE of Home Gardens, CA
  12. 1.6 8km ESE of North Tustin, CA
  13. 2.1 1km WNW of Pomona, CA
  14. 1.8 6km S of Redlands, CA
  15. 1.6 12km NE of Trabuco Canyon, 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.