QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2ml

Earthquake near Glen Avon, CA

No earthquake was likely felt in Glen Avon in the 24 hours to 4:40 am PST (12:40 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 2.2 earthquake was recorded 3 km (2 mi) north-northwest of Glen Avon, CA, at 3:00 am PST on 24 December 2017 (11:00 UTC), 10 km deep. 9 people have reported feeling it to USGS.

USGS: 3km NNW of Glen Avon, CA

5 km (3 mi) NW of Jurupa Valley, CA · 84 km (52 mi) E of Los Angeles, CA

3:00 am PST, Dec 24, 2017 · · 10 km deep · released about 56 lb of TNT

Every earthquake near Glen Avon Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 48 kmLos Angeles County 72 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
3:00 am PST on 24 December 2017 ()
Where
3 km (2 mi) north-northwest of Glen Avon, CA · earthquakes near Glen Avon
Magnitude
M 2.2 (ml)
Depth
10 km below the surface
Felt
9 reports · strongest reported intensity IV
Nearest
Orange County, 48 km SSW
Nearest mapped fault
Red Hill-Etiwanda Avenue fault, 12 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 3235 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 15 km (9 mi) from the epicentre. In Glen Avon, 3 km away, the estimate is intensity II (weak). 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 8 km, intensity II · Fontana 8 km, intensity II · Rubidoux 10 km, intensity II · Eastvale 10 km, intensity II · Rancho Cucamonga 11 km, intensity II · Norco 13 km, intensity II · Riverside 14 km, intensity II · Rialto 14 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 56 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 270,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 190,000× the energy of this one
  3. Around the size people start to feel M 3.0 17× the energy of this one
  4. This earthquake M 2.2 about 56 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

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 · 39 km SSE of this epicentre
  3. 5.6 7km ENE of Running Springs, CA · 48 km ENE of this epicentre
  4. 5.5 The 1990 Upland, California Earthquake · 22 km WNW of this epicentre
  5. 5.4 5km S of Chino Hills, CA · 27 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 34.0405, -117.4983. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 48 km (30 mi) SSW earthquakes near Orange County
Los Angeles County, CA 72 km (45 mi) WNW earthquakes near Los Angeles County
San Diego County, CA 131 km (82 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

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

  1. 2.6 3km ESE of Loma Linda, CA
  2. 1.5 3km ESE of Loma Linda, CA
  3. 1.7 6km SSW of Redlands, CA
  4. 1.5 1km NE of Calimesa, CA
  5. 3.3 3km S of Mentone, CA
  6. 1.7 4km W of Pomona, CA
  7. 2.1 5km SSE of Mentone, CA
  8. 2.2 10km E of Running Springs, CA
  9. 3.5 2km N of Lakeland Village, CA
  10. 2.1 2km N of Lakeland Village, CA
  11. 2.2 2km N of Lakeland Village, CA
  12. 1.9 2km SW of Lake Elsinore, CA
  13. 1.9 3km W of Lake Elsinore, CA
  14. 1.6 5km ESE of North Tustin, CA
  15. 2.2 6km NNE of Fontana, 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.