Earthquake · automatic estimate, may change
M 1.3ml
Earthquake near Chino Hills, CA
No earthquake was likely felt in Chino Hills in the 24 hours to 4:24 am PST (12:24 UTC). The last one was M 3.2, 16 km (10 mi) E, at 5:37 am PDT on 2 September 2026, estimated intensity III (weak) in town; 730 felt reports to USGS. Every earthquake near Chino Hills
This page: a magnitude 1.3 earthquake was recorded 8 km (5 mi) south of Chino Hills, CA, at 5:03 am PDT on 26 September 2026 (12:03 UTC), 5.5 km deep. The magnitude and location are an automatic first estimate and may change.
USGS: 8 km S of Chino Hills, CA
in Chino Hills, CA · 62 km (39 mi) E of Los Angeles, CA
- When
- 5:03 am PDT on 26 September 2026 ()
- Where
- 8 km (5 mi) south of Chino Hills, CA · earthquakes near Chino Hills
- Magnitude
- M 1.3 (ml)
- Depth
- 5.5 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 28 km S
- Nearest mapped fault
- Elsinore fault, 4 km from its surface trace — near is not the same as on
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 47 days ago
Earthquake alerts for Chino Hills, 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 it was probably too small to be felt, even directly above it. 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: Los Serranos, Yorba Linda, Chino, Diamond Bar, Placentia, Villa Park.
How big was it?
This earthquake released about 3.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 4,900,000× the energy of this one
- Magna, Utah 2020 M 5.7 3,500,000× the energy of this one
- Around the size people start to feel M 3.0 310× the energy of this one
- This earthquake M 1.3 about 3.1 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 63,000 times the energy of this one.
Before 2016, the USGS record lists 17 earthquakes of M5 or more within 50 km; the five largest:
- 6.4 The 1933 Long Beach, California Earthquake · 41 km SW of this epicentre
- 6.2 3 km SE of San Bernardino, California · 48 km ENE of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 41 km SE of this epicentre
- 5.9 The 1987 Whittier Narrows, California Earthquake · 34 km WNW of this epicentre
- 5.8 The 1991 Sierra Madre, California Earthquake · 45 km NNW 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 33.9270, -117.7433. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 28 km (17 mi) | S | earthquakes near Orange County |
| Los Angeles County, CA | 56 km (35 mi) | WNW | earthquakes near Los Angeles County |
| San Diego County, CA | 135 km (84 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
51 earthquakes have been recorded within 50 km since this one.
- 0.9 2 km WNW of Fontana, CA
- 0.9 1 km ESE of Loma Linda, CA
- 0.9 2 km W of Fontana, CA
- 1.1 2 km WNW of Fontana, CA
- 1.5 2 km W of Fontana, CA
- 0.9 3 km W of Fontana, CA
- 0.3 11 km ENE of North Tustin, CA
- 1.4 1 km WNW of Loma Linda, CA
- 0.6 9 km NNW of Rancho Cucamonga, CA
- 1.2 2 km NE of Colton, CA
- 0.6 4 km SE of Loma Linda, CA
- 0.8 2 km S of Loma Linda, CA
- 2.1 4 km N of Fontana, CA
- 1.0 5 km SE of Lytle Creek, CA
- 0.3 9 km WSW of Corona, 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| location | 7 km S of Chino Hills, CA | 8 km S of Chino Hills, CA | |
| longitude | -117.74 | -117.74 | |
| latitude | 33.93 | 33.93 | |
| depth | 4.86 | 5.46 | |
| magnitude | 1.35 | 1.34 |
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.