Live earthquake check
Earthquakes near Altadena today
Updated
No M2.5+ earthquake within 100 km of Altadena in the last 24 hours 3 smaller quakes (largest M1.8) were recorded within 100 km; the latest 5 hours ago.
Recent earthquakes near Altadena
USGS recorded 2 earthquakes of magnitude 2.5 or more within 100 km of Altadena in the past 30 days, 0 of them in the last 7 days. The most recent was M3.2 45 km S of the city at Oct 9, 00:44 local time (28 days ago).
The average depth was about 9 km and 2 of 2 were shallow (under 70 km), which are the ones most likely to be felt at the surface.
USGS also lists 3 smaller quakes (below M2.5) within 100 km in the last 24 hours; these are rarely felt.
| Time (Altadena) | UTC | Magnitude | Distance | Depth | Location |
|---|---|---|---|---|---|
| Oct 14, 20:30 | Oct 15, 03:30 UTC | M2.8 | 116 km ESE | 14 km | 3 km NNW of San Jacinto, CA |
| Oct 11, 01:04 | Oct 11, 08:04 UTC | M2.7 | 121 km ESE | 12 km | 4 km E of San Jacinto, CA |
| Oct 9, 00:44 | Oct 9, 07:44 UTC | M3.2 | 45 km S | 12 km | 2 km SW of Signal Hill, CA |
| Oct 8, 01:09 | Oct 8, 08:09 UTC | M2.7 | 61 km E | 6 km | 2 km WNW of Fontana, CA |
M2.5+ within 150 km, past 30 days, newest first. Times in America/Los_Angeles.
Was there an earthquake in Altadena just now? This page checks the live USGS catalogue for quakes around Altadena, California, United States and updates every few minutes.
- Last 24 hours
- 0 M2.5+ within 100 km
- Last 7 days
- 0 M2.5+ within 100 km
- Last 30 days
- 2 M2.5+ within 100 km
- Largest in 30 days
- M3.2 45 km S, Oct 9, 2026
- Largest in past year
- M4.3 128 km NNE, Jul 13, 2026
- Past year count
- 154 M2.5+ within 150 km
- Nearest in 30 days
- 45 km M3.2, Oct 9, 2026
Largest earthquakes near Altadena in the past year
The strongest earthquake within 150 km of Altadena in the past 12 months was M4.3 on Jul 13, 2026, 128 km NNE of the city (18 km WSW of Johannesburg, CA).
With 154 M2.5+ earthquakes in a year (about 12.8 a month), the area around Altadena is very active by global standards. 0 of the ten largest reached M4.5, the level at which damage near the epicentre becomes possible.
| Date | Magnitude | Distance | Depth | Location |
|---|---|---|---|---|
| Jul 13, 2026 | M4.3 | 128 km NNE | 8 km | 18 km WSW of Johannesburg, CA |
| Jul 12, 2026 | M4.1 | 101 km NW | 13 km | 2 km ESE of Frazier Park, CA |
| Jun 1, 2026 | M4.1 | 127 km NNE | 8 km | 18 km WSW of Johannesburg, CA |
| Sep 30, 2026 | M3.8 | 62 km WNW | 10 km | 4 km SE of Piru, CA |
| Dec 14, 2025 | M3.6 | 88 km WNW | 11 km | 13 km NW of Fillmore, CA |
| Feb 17, 2026 | M3.6 | 121 km ESE | 14 km | 4 km S of Banning, CA |
| Sep 27, 2026 | M3.6 | 50 km SW | 12 km | 7 km WSW of Hermosa Beach, CA |
| Jan 18, 2026 | M3.6 | 132 km NNE | 5 km | 15 km WSW of Johannesburg, CA |
| Jun 17, 2026 | M3.5 | 127 km NNE | 8 km | 18 km WSW of Johannesburg, CA |
| Feb 26, 2026 | M3.5 | 139 km NNE | 4 km | 18 km ESE of Johannesburg, CA |
Was it felt in Altadena?
The largest nearby quake this month, M3.2 at 45 km, was probably too small or too distant to notice in Altadena by a rough rule of thumb (an M3 is typically noticed within a few tens of km, an M5 up to a few hundred km; local ground and building type matter a lot).
USGS "Did You Feel It?" received reports for 4 of these quakes: M2.8 on Oct 15, 2026 (88 reports, max intensity 2.7); M2.7 on Oct 11, 2026 (58 reports, max intensity 2.9); M3.2 on Oct 9, 2026 (1092 reports, max intensity 3.4); M2.7 on Oct 8, 2026 (158 reports, max intensity 3.1).
If you felt shaking, you can report it to USGS; reports refine the intensity map within minutes.
Tsunami warning status
None of the earthquakes near Altadena in the past year carried the USGS tsunami flag, which USGS sets for large quakes in oceanic regions where the tsunami warning centres issue messages.
Official tsunami warnings come from the NOAA tsunami warning centres (tsunami.gov) and national agencies; follow local authorities if you are on a coast after strong shaking.
Earthquakes around the world today
Worldwide, USGS listed 170 earthquakes of M1+ in the last 24 hours; the largest was M6.1 Fiji region.
USGS lists every magnitude in the United States but outside it coverage is complete only from about M4–4.5, so smaller local quakes reported by national agencies may be missing. Magnitudes and locations are revised for hours after an event.
Earthquakes near other cities in United States and nearby
Earthquake pages
More live data for Altadena
Data: USGS Earthquake Hazards Program (ComCat), GeoNames (cities, CC BY 4.0).