Live earthquake check
Earthquakes near Hercules today
Updated
No M2.5+ earthquake within 100 km of Hercules in the last 24 hours 6 smaller quakes (largest M1.9) were recorded within 100 km; the latest 11 hours ago.
Was there an earthquake in Hercules just now? This page checks the live USGS catalogue for quakes around Hercules, California, United States and updates every few minutes.
- Last 24 hours
- 0 M2.5+ within 100 km
- Last 7 days
- 1 M2.5+ within 100 km
- Last 30 days
- 5 M2.5+ within 100 km
- Largest in 30 days
- M3.3 99 km SE, Sep 27, 2026
- Largest in past year
- M4.6 101 km S, Apr 2, 2026
- Past year count
- 230 M2.5+ within 150 km
- Nearest in 30 days
- 44 km M2.5, Sep 29, 2026
Recent earthquakes near Hercules
USGS recorded 5 earthquakes of magnitude 2.5 or more within 100 km of Hercules in the past 30 days, 1 of them in the last 7 days. The most recent was M2.5 95 km NNW of the city at Oct 20, 09:23 local time (5 days ago).
The average depth was about 4 km and 5 of 5 were shallow (under 70 km), which are the ones most likely to be felt at the surface. The busiest day was Sep 27, 2026 with 2 quakes.
USGS also lists 6 smaller quakes (below M2.5) within 100 km in the last 24 hours; these are rarely felt.
| Time (Hercules) | UTC | Magnitude | Distance | Depth | Location |
|---|---|---|---|---|---|
| Oct 24, 13:39 | Oct 24, 20:39 UTC | M2.5 | 101 km NNW | 2 km | 7 km W of Cobb, CA |
| Oct 21, 21:18 | Oct 22, 04:18 UTC | M3.1 | 133 km SE | -1 km | 23 km WSW of Gustine, CA |
| Oct 20, 09:23 | Oct 20, 16:23 UTC | M2.5 | 95 km NNW | 0 km | 2 km NW of The Geysers, CA |
| Oct 15, 10:57 | Oct 15, 17:57 UTC | M2.5 | 136 km SSE | 6 km | 10 km E of Gilroy, CA |
| Oct 14, 23:06 | Oct 15, 06:06 UTC | M2.8 | 100 km NNW | 2 km | 7 km NW of The Geysers, CA |
| Sep 30, 14:07 | Sep 30, 21:07 UTC | M2.9 | 102 km NNW | 5 km | 8 km ESE of Cloverdale, CA |
| Sep 30, 13:48 | Sep 30, 20:48 UTC | M2.5 | 90 km NNW | 2 km | 1 km SSW of Anderson Springs, CA |
| Sep 29, 09:06 | Sep 29, 16:06 UTC | M2.5 | 44 km NNW | 8 km | 5 km W of Yountville, CA |
| Sep 27, 07:40 | Sep 27, 14:40 UTC | M2.6 | 99 km SE | 4 km | 26 km WSW of Westley, CA |
| Sep 27, 07:21 | Sep 27, 14:21 UTC | M3.3 | 99 km SE | 3 km | 27 km WSW of Westley, CA |
M2.5+ within 150 km, past 30 days, newest first. Times in America/Los_Angeles.
Largest earthquakes near Hercules in the past year
The strongest earthquake within 150 km of Hercules in the past 12 months was M4.6 on Apr 2, 2026, 101 km S of the city (1 km SE of Boulder Creek, CA).
With 230 M2.5+ earthquakes in a year (about 19.2 a month), the area around Hercules is very active by global standards. 1 of the ten largest reached M4.5, the level at which damage near the epicentre becomes possible.
| Date | Magnitude | Distance | Depth | Location |
|---|---|---|---|---|
| Apr 2, 2026 | M4.6 | 101 km S | 10 km | 1 km SE of Boulder Creek, CA |
| May 7, 2026 | M4.4 | 96 km NNW | 4 km | 2 km NW of The Geysers, CA |
| Jul 29, 2026 | M4.2 | 102 km NNW | 6 km | 8 km ESE of Cloverdale, CA |
| Feb 2, 2026 | M4.2 | 42 km SE | 10 km | 4 km SE of San Ramon, CA |
| Jan 8, 2026 | M4.2 | 104 km NNW | 3 km | 12 km ENE of Cloverdale, CA |
| Feb 21, 2026 | M4.2 | 99 km NNW | 2 km | 5 km W of Cobb, CA |
| Dec 14, 2025 | M4.0 | 48 km NW | 3 km | 6 km W of Glen Ellen, CA |
| Nov 26, 2025 | M4.0 | 134 km SSE | 3 km | 8 km E of Gilroy, CA |
| Dec 20, 2025 | M4.0 | 42 km SE | 10 km | 5 km SSE of San Ramon, CA |
| Nov 24, 2025 | M3.9 | 95 km NNW | 2 km | 1 km NNW of The Geysers, CA |
Was it felt in Hercules?
The largest nearby quake this month, M3.3 at 99 km, was probably too small or too distant to notice in Hercules 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 9 of these quakes: M2.5 on Oct 24, 2026 (1 reports, max intensity 2); M3.1 on Oct 22, 2026 (9 reports, max intensity 2.1); M2.5 on Oct 20, 2026 (1 reports, max intensity 2); M2.5 on Oct 15, 2026 (3 reports, max intensity 2).
If you felt shaking, you can report it to USGS; reports refine the intensity map within minutes.
Tsunami warning status
3 earthquakes near Hercules in the past year carried the USGS tsunami flag: M4.2 4 km SE of San Ramon, CA (Feb 2, 2026); M4.0 6 km W of Glen Ellen, CA (Dec 14, 2025); M4.0 8 km E of Gilroy, CA (Nov 26, 2025). The flag means the quake was large enough and in an oceanic region where tsunami warning centres issue messages; it does not mean a tsunami happened.
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 145 earthquakes of M1+ in the last 24 hours; the largest was M6.5 Bonin Islands, Japan 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 Hercules
Data: USGS Earthquake Hazards Program (ComCat), GeoNames (cities, CC BY 4.0).