Earthquake · reviewed by a seismologist
M 1.8ml
Earthquake near Fontana, CA
No earthquake was likely felt in Fontana in the 24 hours to 6:37 am PST (14:37 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 1.8 earthquake was recorded 23 km (14 mi) north-northwest of Fontana, CA, at 10:37 am PST on 11 February 2020 (18:37 UTC), 11 km deep.
USGS: 4km NNE of Lytle Creek, CA
90 km (56 mi) ENE of Los Angeles, CA · 19 km (12 mi) NNE of Rancho Cucamonga, CA
- When
- 10:37 am PST on 11 February 2020 ()
- Where
- 23 km (14 mi) north-northwest of Fontana, CA · earthquakes near Fontana
- Magnitude
- M 1.8 (ml)
- Depth
- 11 km below the surface
- Felt
- no reports yet
- Nearest
- Los Angeles County, 72 km W
- Nearest mapped fault
- San Andreas fault, under 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 2466 days ago
Earthquake alerts for Fontana, CA
Get a notification in this browser when USGS records an earthquake near Fontana, CA. No account or email needed.
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 8 km (5 mi) from the epicentre. In Fontana, 23 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.
Earthquakes near other towns within 30 km: Oak Hills, Wrightwood, Phelan, Crestline, Muscoy, Piñon Hills.
How big was it?
This earthquake released about 16 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.
- Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
- Magna, Utah 2020 M 5.7 680,000× the energy of this one
- Around the size people start to feel M 3.0 61× the energy of this one
- This earthquake M 1.8 about 16 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 7,200 times the energy of this one.
Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:
- 6.2 3 km SE of San Bernardino, California · 31 km SE of this epicentre
- 5.8 The 1991 Sierra Madre, California Earthquake · 46 km W of this epicentre
- 5.6 7km ENE of Running Springs, CA · 42 km E of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 25 km SW of this epicentre
- 5.4 5km S of Chino Hills, CA · 46 km SSW 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 34.2938, -117.4900. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Los Angeles County, CA | 72 km (45 mi) | W | earthquakes near Los Angeles County |
| Orange County, CA | 74 km (46 mi) | SSW | earthquakes near Orange County |
| Kern County, CA | 163 km (101 mi) | NW | earthquakes near Kern 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.
- 1.7 1km ESE of Redlands, CA
- 1.8 1km SE of Redlands, CA
- 1.6 1km ESE of Redlands, CA
- 2.2 5km NW of Mira Loma, CA
- 1.6 6km S of Redlands, CA
- 1.6 4km SE of Loma Linda, CA
- 2.0 3km NNW of Fontana, CA
- 1.5 3km SE of Home Gardens, CA
- 1.5 5km S of Lytle Creek, CA
- 1.8 5km S of Lytle Creek, CA
- 2.5 2km NNE of Lake Arrowhead, CA
- 1.5 5km NE of Bradbury, CA
- 1.9 0km NE of Wrightwood, CA
- 2.0 4km SE of Home Gardens, CA
- 1.7 3km ESE of Home Gardens, 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.