Earthquake · reviewed by a seismologist
M 2.3ml
Earthquake near Glendora, CA
No earthquake was likely felt in Glendora in the 24 hours to 11:42 pm PST (07:42 UTC). The last one was M 3.6, 64 km (40 mi) WSW, at 8:40 am PDT on 27 September 2026, estimated intensity II (weak) in town; 1,735 felt reports to USGS. Every earthquake near Glendora
This page: a magnitude 2.3 earthquake was recorded 6 km (3 mi) east-northeast of Glendora, CA, at 7:53 am PDT on 14 October 2017 (14:53 UTC), 11 km deep.
USGS: 6km ENE of Glendora, CA
in Glendora, CA · 57 km (36 mi) ENE of Los Angeles, CA
- When
- 7:53 am PDT on 14 October 2017 ()
- Where
- 6 km (3 mi) east-northeast of Glendora, CA · earthquakes near Glendora
- Magnitude
- M 2.3 (ml)
- Depth
- 11 km below the surface
- Felt
- no reports yet
- Nearest
- Los Angeles County, 42 km W
- Nearest mapped fault
- Sierra Madre fault, 1 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 3303 days ago
Earthquake alerts for Glendora, CA
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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 17 km (11 mi) from the epicentre. In Glendora, 6 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: Glendora 6 km, intensity II · San Dimas 6 km, intensity II · La Verne 7 km, intensity II · Azusa 9 km, intensity II · Covina 10 km, intensity II · Claremont 11 km, intensity II · Pomona 12 km, intensity II · Montclair 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 98 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 150,000× the energy of this one
- Magna, Utah 2020 M 5.7 110,000× the energy of this one
- Around the size people start to feel M 3.0 9.8× the energy of this one
- This earthquake M 2.3 about 98 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 9 earthquakes of M5 or more within 50 km; the five largest:
- 5.9 The 1987 Whittier Narrows, California Earthquake · 27 km WSW of this epicentre
- 5.8 The 1991 Sierra Madre, California Earthquake · 21 km NW of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 11 km E of this epicentre
- 5.4 5km S of Chino Hills, CA · 23 km S of this epicentre
- 5.2 3km W of Lytle Creek, CA · 28 km ENE 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 34.1562, -117.8107. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Los Angeles County, CA | 42 km (26 mi) | W | earthquakes near Los Angeles County |
| Orange County, CA | 54 km (33 mi) | S | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
42 earthquakes have been recorded within 50 km since this one.
- 1.7 5km WNW of Fontana, CA
- 2.5 3km NW of Lytle Creek, CA
- 1.6 4km WNW of La Mirada, CA
- 1.6 3km S of South Whittier, CA
- 1.9 4km SE of Home Gardens, CA
- 2.3 9km WSW of Lytle Creek, CA
- 1.5 5km SE of Home Gardens, CA
- 1.6 2km W of Walnut, CA
- 1.6 3km N of Rancho Cucamonga, CA
- 1.5 3km ENE of Rialto, CA
- 3.1 4km SE of Ontario, CA
- 1.6 4km WNW of Muscoy, CA
- 1.6 2km W of Devore, CA
- 2.2 9km SW of Lytle Creek, CA
- 2.4 3km SW of San Bernardino, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.