QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

6km SSE of Pedley, CA

· 5.3 km deep · released about 430 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 40 kmLos Angeles County 80 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 2.8 (ml)
Depth
5.3 km below the surface
Felt
866 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
Nearest
Orange County, 40 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1874 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 866 people have reported feeling it to USGS.

How big was it?

This earthquake released about 430 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 35,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 25,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.2× the energy of this one
  4. This earthquake M 2.8 about 430 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 33.9233, -117.4623. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 40 km (25 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 80 km (50 mi) ESE of here earthquakes near Los Angeles County
San Diego County, CA 119 km (74 mi) NNW of here earthquakes near San Diego County
San Bernardino County, CA 157 km (97 mi) SW of here earthquakes near San Bernardino 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. 1.8 5km NW of Glen Avon, CA
  2. 1.6 6km N of Fontana, CA
  3. 1.8 9km WSW of Corona, CA
  4. 1.7 4km ENE of Calimesa, CA
  5. 1.8 7km NNE of Fontana, CA
  6. 1.5 5km SSW of Redlands, CA
  7. 1.5 6km SSE of Rancho Cucamonga, CA
  8. 1.6 4km SE of Home Gardens, CA
  9. 2.0 5km NW of Glen Avon, CA
  10. 1.7 6km NW of Glen Avon, CA
  11. 1.6 4km SE of Lytle Creek, CA
  12. 2.9 5km NW of Glen Avon, CA
  13. 1.6 5km NW of Glen Avon, CA
  14. 1.7 6km NW of Glen Avon, CA
  15. 1.5 5km NNE of Moreno Valley, 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 4.4 on 2018-08-29 — it released about 260 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.