Earthquake · reviewed by a seismologist
M 0.9ml
Earthquake near Ontario, CA
USGS: 6 km SE of Ontario, CA
in Ontario, CA · 76 km (47 mi) E of Los Angeles, CA
- When
- 10:23 am PDT on 30 September 2026 ()
- Where
- 8 km (5 mi) SE of Ontario, CA · earthquakes near Ontario
- Magnitude
- M 0.9 (ml)
- Depth
- 4.4 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 42 km SSW
- Nearest mapped fault
- Red Hill-Etiwanda Avenue fault, 11 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 2 days ago
A magnitude 0.9 earthquake was recorded 8 km (5 mi) SE of Ontario, CA, at 10:23 am PDT on 30 September 2026 (17:23 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Eastvale, Jurupa Valley, Glen Avon, Chino, Norco, Rancho Cucamonga.
How big was it?
This earthquake released about 0.63 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 1.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 24,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 17,000,000× the energy of this one
- Around the size people start to feel M 3.0 1,500× the energy of this one
- This earthquake M 0.9 about 0.63 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 310,000 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 · 31 km ENE of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 39 km SSE of this epicentre
- 5.9 The 1987 Whittier Narrows, California Earthquake · 46 km W of this epicentre
- 5.8 The 1991 Sierra Madre, California Earthquake · 47 km NW of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 18 km NW 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 34.0155, -117.5862. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 42 km (26 mi) | SSW | earthquakes near Orange County |
| Los Angeles County, CA | 65 km (41 mi) | WNW | earthquakes near Los Angeles County |
| San Diego County, CA | 133 km (83 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
10 earthquakes have been recorded within 50 km since this one.
- 1.0 8 km S of Llano, CA
- 1.2 2 km SE of Home Gardens, CA
- 1.5 5 km SSE of Home Gardens, CA
- 1.3 7 km SSE of Home Gardens, CA
- 1.2 4 km N of Rancho Cucamonga, CA
- 2.1 4 km W of Devore, CA
- 1.0 2 km SSE of Loma Linda, CA
- 1.3 5 km NNW of Running Springs, CA
- 0.9 4 km W of Devore, CA
- 1.2 2 km 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| review status | automatic | reviewed |
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.