Earthquakes in Orange County, California
Elevated QuakeIndex 76 / 100
2 quakes of M1.5 or larger in the last 7 days within 50 km. Normal for here is 1 to 4 in a week.
Compared against Orange County, California's own 10 years · USGS catalogue · updated
The last 30 days
Live · last 7 days
Latest earthquakes within 50 km
None within 50 km in the latest snapshot we hold; the full 7 days load from USGS as this page opens.
Source USGS · snapshot of
Where this is
Map loads when it scrolls into view
Centre 33.676, -117.777 — the Census internal point, from the US Census Bureau Gazetteer (2024). Activity is measured within 50 km of it.
Largest on record nearby
| Magnitude | When | Where |
|---|---|---|
| M 4.5 | 3km WSW of South El Monte, CA | |
| M 4.3 | 2km E of Carson, CA | |
| M 4.1 | 10 km SW of Corona, CA | |
| M 4.0 | 5 km SE of Ontario, CA | |
| M 4.0 | 12km NE of Trabuco Canyon, CA | |
| M 4.0 | 1km ESE of Wildomar, CA | |
| M 4.0 | 4 km SE of Ontario, CA | |
| M 3.7 | 19km NE of Avalon, CA |
From the QuakeIndex catalogue, built from the USGS FDSN event service · within 50 km of the centre above.
After an earthquake here
- Report what you felt to USGS — reports go to USGS, not to us, and they are what produces the intensity maps
- What to do during and after an earthquake
- Check the roads — Nevada Explorer, for Reno, Tahoe and the Sierra passes
- QuakeIndex does not issue warnings. For early warning, ShakeAlert reaches phones through Wireless Emergency Alerts and the MyShake app