Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Montclair, CA
No earthquake was likely felt in Montclair in the 24 hours to 6:58 am PST (14:58 UTC). The last one was M 2.7, 19 km (12 mi) E, at 1:09 am PDT on 8 October 2026, estimated intensity II (weak) in town; 158 felt reports to USGS. Every earthquake near Montclair
This page: a magnitude 1.7 earthquake was recorded in Montclair, CA, at 10:06 am PST on 13 February 2025 (18:06 UTC), 11 km deep.
USGS: 1 km SSE of Montclair, CA
6 km (4 mi) SSW of Upland, CA · 67 km (42 mi) E of Los Angeles, CA
- When
- 10:06 am PST on 13 February 2025 ()
- Where
- in Montclair, CA · earthquakes near Montclair
- Magnitude
- M 1.7 (ml)
- Depth
- 11 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 44 km S
- Nearest mapped fault
- Sierra Madre 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 637 days ago
Earthquake alerts for Montclair, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
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 6 km (4 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: Montclair in town, intensity II · Ontario 3 km, intensity II · Claremont 4 km, intensity II · Upland 5 km, intensity II · Pomona 6 km, intensity II · Chino 6 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 12 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,300,000× the energy of this one
- Magna, Utah 2020 M 5.7 900,000× the energy of this one
- Around the size people start to feel M 3.0 80× the energy of this one
- This earthquake M 1.7 about 12 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 4.5 on 2020-09-19 — about 16,000 times the energy of this one.
Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:
- 6.2 3 km SE of San Bernardino, California · 40 km E of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 49 km SSE of this epicentre
- 5.9 The 1987 Whittier Narrows, California Earthquake · 36 km W of this epicentre
- 5.8 The 1991 Sierra Madre, California Earthquake · 36 km NW of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 8 km N 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 34.0688, -117.6877. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 44 km (28 mi) | S | earthquakes near Orange County |
| Los Angeles County, CA | 55 km (34 mi) | WNW | earthquakes near Los Angeles County |
| San Diego County, CA | 144 km (89 mi) | SE | 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.
- 1.5 5 km N of Fontana, CA
- 1.6 5 km ESE of Yorba Linda, CA
- 1.5 5 km SSE of Home Gardens, CA
- 1.5 7 km W of Muscoy, CA
- 1.6 4 km ESE of Loma Linda, CA
- 1.8 3 km SSE of Cudahy, CA
- 1.5 1 km NNE of Loma Linda, CA
- 2.1 2 km ESE of Loma Linda, CA
- 1.5 6 km NNE of Fontana, CA
- 2.0 5 km N of Moreno Valley, CA
- 1.7 6 km W of Pinon Hills, CA
- 1.6 3 km N of Placentia, CA
- 1.5 6 km NNW of Mira Loma, CA
- 1.7 4 km SE of Home Gardens, CA
- 2.0 1 km NE of Loma Linda, 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.