QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

Earthquake near Glen Avon, CA

No earthquake was likely felt in Glen Avon in the 24 hours to 9:52 pm PST (05:52 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 1.8 earthquake was recorded 7 km (5 mi) northwest of Glen Avon, CA, at 7:29 am PDT on 30 September 2016 (14:29 UTC), 11 km deep.

USGS: 7km NW of Glen Avon, CA

6 km (4 mi) ENE of Ontario, CA · 80 km (50 mi) E of Los Angeles, CA

7:29 am PDT, Sep 30, 2016 · · 11 km deep · released about 17 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 68 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
7:29 am PDT on 30 September 2016 ()
Where
7 km (5 mi) northwest of Glen Avon, CA · earthquakes near Glen Avon
Magnitude
M 1.8 (ml)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Orange County, 47 km SSW
Nearest mapped fault
Red Hill-Etiwanda Avenue fault, 8 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 3694 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 8 km (5 mi) from the epicentre. In Glen Avon, 7 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: Rancho Cucamonga 7 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 12 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.2 3 km SE of San Bernardino, California · 27 km E of this epicentre
  2. 6.0 The 1910 Lake Elsinore, California Earthquake · 42 km SSE of this epicentre
  3. 5.9 The 1987 Whittier Narrows, California Earthquake · 49 km W of this epicentre
  4. 5.8 The 1991 Sierra Madre, California Earthquake · 48 km WNW of this epicentre
  5. 5.5 The 1990 Upland, California Earthquake · 17 km NW 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 34.0553, -117.5447. 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 68 km (42 mi) WNW earthquakes near Los Angeles County
San Diego County, CA 135 km (84 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

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

  1. 1.6 5km SE of Loma Linda, CA
  2. 1.7 7km NE of Trabuco Canyon, CA
  3. 2.6 10km NNE of Lake Arrowhead, CA
  4. 1.9 6km ESE of Ontario, CA
  5. 1.7 4km ENE of Moreno Valley, CA
  6. 2.4 1km ENE of Brea, CA
  7. 1.6 10km SSW of Calimesa, CA
  8. 1.9 1km ESE of Loma Linda, CA
  9. 2.1 8km WSW of Beaumont, CA
  10. 3.0 1km E of Loma Linda, CA
  11. 2.2 2km N of Lake Arrowhead, CA
  12. 2.0 3km SSW of Redlands, CA
  13. 1.8 4km N of Moreno Valley, CA
  14. 1.6 4km SE of Home Gardens, CA
  15. 1.6 6km NE of Nuevo, 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.