QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

Earthquake near Glen Avon, CA

No earthquake was likely felt in Glen Avon in the 24 hours to 5:30 am PST (13:30 UTC). The last one was M 1.6, 9 km (6 mi) N, at 6:17 am PDT on 26 October 2026, estimated intensity II (weak) in town. Every earthquake near Glen Avon

This page: a magnitude 2.8 earthquake was recorded in Glen Avon, CA, at 1:16 am PDT on 10 May 2023 (08:16 UTC), 18 km deep. 92 people have reported feeling it to USGS.

USGS: 2km NW of Glen Avon, CA

in Jurupa Valley, CA · 84 km (52 mi) E of Los Angeles, CA

1:16 am PDT, May 10, 2023 · · 18 km deep · released about 480 lb of TNT

Every earthquake near Glen Avon Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 47 kmLos Angeles County 73 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
1:16 am PDT on 10 May 2023 ()
Where
in Glen Avon, CA · earthquakes near Glen Avon
Magnitude
M 2.8 (ml)
Depth
18 km below the surface
Felt
92 reports · strongest reported intensity III
Nearest
Orange County, 47 km SSW
Nearest mapped fault
Red Hill-Etiwanda Avenue fault, 13 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 899 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 21 km (13 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Pedley 6 km, intensity II · Eastvale 9 km, intensity II · Rubidoux 9 km, intensity II · Fontana 10 km, intensity II · Norco 11 km, intensity II · Riverside 12 km, intensity II · Rancho Cucamonga 13 km, intensity II · Ontario 15 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 480 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 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.4 on 2018-08-29 — about 230 times the energy of this one.

Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.2 3 km SE of San Bernardino, California · 23 km ENE of this epicentre
  2. 6.0 The 1910 Lake Elsinore, California Earthquake · 37 km SSE of this epicentre
  3. 5.6 7km ENE of Running Springs, CA · 49 km ENE of this epicentre
  4. 5.5 The 1990 Upland, California Earthquake · 23 km NW of this epicentre
  5. 5.4 5km S of Chino Hills, CA · 26 km WSW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 34.0245, -117.4983. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 47 km (29 mi) SSW earthquakes near Orange County
Los Angeles County, CA 73 km (45 mi) WNW earthquakes near Los Angeles County
San Diego County, CA 130 km (81 mi) SSE earthquakes near San Diego County

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

Aftershocks so far

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

  1. 1.5 8 km SE of Wrightwood, CA
  2. 1.5 6km NE of Fontana, CA
  3. 2.5 2 km SE of Redlands, CA
  4. 1.5 5 km SSE of Home Gardens, CA
  5. 2.6 8km NNW of Rancho Cucamonga, CA
  6. 1.7 2km NNW of Colton, CA
  7. 1.6 10km WSW of Corona, CA
  8. 1.8 10km WSW of Corona, CA
  9. 2.7 6km NE of Fontana, CA
  10. 1.9 8km SSE of Wrightwood, CA
  11. 1.5 4km SE of Home Gardens, CA
  12. 1.5 7km SSE of Home Gardens, CA
  13. 1.7 2km NNE of Colton, CA
  14. 2.1 10km WSW of Corona, CA
  15. 1.6 6km NW of Rialto, 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.