Earthquake · reviewed by a seismologist
M 1.5ml
Earthquake near Fontana, CA
No earthquake was likely felt in Fontana in the 24 hours to 4:43 am PST (12:43 UTC). The last one was M 1.6, 5 km (3 mi) W, at 6:17 am PDT on 26 October 2026, estimated intensity II (weak) in town. Every earthquake near Fontana
This page: a magnitude 1.5 earthquake was recorded 4 km (3 mi) northwest of Fontana, CA, at 11:20 pm PST on 2 November 2020 (07:20 UTC), 5.5 km deep. 2 people have reported feeling it to USGS.
USGS: 2km NNW of Fontana, CA
in Fontana, CA · 87 km (54 mi) E of Los Angeles, CA
- When
- 11:20 pm PST on 2 November 2020 ()
- Where
- 4 km (3 mi) northwest of Fontana, CA · earthquakes near Fontana
- Magnitude
- M 1.5 (ml)
- Depth
- 5.5 km below the surface
- Felt
- 2 reports · strongest reported intensity II
- Nearest
- Orange County, 57 km SSW
- Nearest mapped fault
- Sierra Madre fault, 5 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 2200 days ago
Earthquake alerts for Fontana, 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 8 km (5 mi) from the epicentre. In Fontana, 4 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: Fontana 4 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 5.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
- Around the size people start to feel M 3.0 170× the energy of this one
- This earthquake M 1.5 about 5.6 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 20,000 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.2 3 km SE of San Bernardino, California · 20 km E of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 47 km S of this epicentre
- 5.6 7km ENE of Running Springs, CA · 42 km ENE of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 21 km W of this epicentre
- 5.4 5km S of Chino Hills, CA · 33 km SW 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 34.1177, -117.4688. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 57 km (35 mi) | SSW | earthquakes near Orange County |
| Los Angeles County, CA | 73 km (46 mi) | W | earthquakes near Los Angeles County |
| San Bernardino County, CA | 144 km (89 mi) | NE | earthquakes near San Bernardino County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
50 earthquakes have been recorded within 50 km since this one.
- 1.9 4km NNW of Orange, CA
- 2.0 9km E of Yucaipa, CA
- 1.9 6km WNW of Calimesa, CA
- 1.8 8km ENE of Moreno Valley, CA
- 1.7 2km SE of Placentia, CA
- 2.7 2km SSE of Placentia, CA
- 1.8 2km NNE of Villa Park, CA
- 1.6 7km SSE of Home Gardens, CA
- 1.6 4km SE of Home Gardens, CA
- 2.4 8km NNW of Fontana, CA
- 1.5 5km SSE of Crestline, CA
- 1.6 2km NNW of Fontana, CA
- 1.6 4km NNW of Fontana, CA
- 1.9 2km E of Moreno Valley, CA
- 1.6 2km SE of Muscoy, 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.