Earthquake · reviewed by a seismologist
M 3.0ml
Earthquake near Fontana, CA
No earthquake was likely felt in Fontana in the 24 hours to 4:17 am PST (12:17 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 3.0 earthquake was recorded 5 km (3 mi) north-northeast of Fontana, CA, at 6:23 am PDT on 10 April 2018 (13:23 UTC), 4.0 km deep. 366 people have reported feeling it to USGS.
USGS: 6km NE of Fontana, CA
in Fontana, CA · in Rialto, CA
- When
- 6:23 am PDT on 10 April 2018 ()
- Where
- 5 km (3 mi) north-northeast of Fontana, CA · earthquakes near Fontana
- Magnitude
- M 3.0 (ml)
- Depth
- 4.0 km below the surface
- Felt
- 366 reports · strongest reported intensity V
- Measured shaking
- intensity V (ShakeMap)
- Nearest
- Orange County, 61 km SSW
- Nearest mapped fault
- San Jacinto fault, 4 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 2997 days ago
Earthquake alerts for Fontana, 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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 37 km (23 mi) from the epicentre. In Fontana, 5 km away, the estimate is intensity III (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 5 km, intensity III · Rialto 6 km, intensity III · Muscoy 8 km, intensity III · Colton 12 km, intensity III · San Bernardino 13 km, intensity III · Rubidoux 16 km, intensity III · Rancho Cucamonga 16 km, intensity III · Loma Linda 18 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 990 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 340,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
- Magna, Utah 2020 M 5.7 11,000× the energy of this one
- This earthquake M 3.0 about 990 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 14 earthquakes of M5 or more within 50 km; the five largest:
- 6.2 3 km SE of San Bernardino, California · 16 km ESE of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 49 km S of this epicentre
- 5.6 7km ENE of Running Springs, CA · 37 km ENE of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 25 km W of this epicentre
- 5.4 5km S of Chino Hills, CA · 38 km WSW 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 34.1382, -117.4238. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 61 km (38 mi) | SSW | earthquakes near Orange County |
| Los Angeles County, CA | 77 km (48 mi) | W | earthquakes near Los Angeles County |
| San Bernardino County, CA | 139 km (86 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
53 earthquakes have been recorded within 50 km since this one.
- 2.2 8km ENE of Moreno Valley, CA
- 1.6 8km ENE of Moreno Valley, CA
- 2.0 5km ENE of Ontario, CA
- 2.1 12km NW of Big Bear Lake, CA
- 2.2 5km SE of Loma Linda, CA
- 1.9 6km N of Moreno Valley, CA
- 1.9 6km E of Calimesa, CA
- 1.7 8km S of Hesperia, CA
- 1.9 4km SE of Home Gardens, CA
- 1.7 7km N of Running Springs, CA
- 1.6 6km N of Beaumont, CA
- 1.6 4km ENE of Calimesa, CA
- 1.7 10km SSW of Lucerne Valley, CA
- 2.0 7km NNW of Big Bear Lake, CA
- 2.2 3km ENE of Calimesa, 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.