Reported by USGS today.
It is one of only 4 we have recorded within 20 km of this point since 16 May 2026. Another comparable one was recorded here earlier the same day.
What the source measured
USGS reported: 3 km ESE of Larkfield-Wikiup, CA
USGS recorded magnitude 3.3 at a depth of 9 km.
An estimated 102,866 people live within 15 km of this point.
This is the lowest magnitude we have recorded at this point, over 94 readings since 3 September 2026 — the previous range was 3.34 to 3.54.
Nearby, since 16 May 2026
- May 16, 2026 · score 0 · 18.6 km
- July 20, 2026 · score 0 · 20.1 km
How we know
One source: USGS. Not yet confirmed by a second, independent source.
Our own score for this event is 21 out of 100, at 73 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Earthquakes |
| Severity | Low |
| Calamity Score (ours) | 21 / 100 |
| Our confidence | 73% |
| Coordinates | 38.5010, -122.7150 |
| Nearest City | Santa Rosa (7 km) |
| Population Exposed | 102.9K within 15 km |
| Impact Tier | minor |
| Timestamp | 2026-09-03T17:33:27.320Z |
| Source | https://earthquake.usgs.gov/earthquakes/eventpage/nc75429272 |
Score Breakdown
Technical Details
| Mag | 3.34 |
| Depth | 8.84 |
| Tsunami | false |
| Felt | 1794 |
| Mmi | 3.65 |
| Sig | 512 |
| Usgs Dyfi Mag | 3.34 |
| Usgs Dyfi Depth | 8.84 |
| Usgs Dyfi Felt | 1791 |
| Usgs Dyfi Cdi | 3.4 |
| Usgs Dyfi CdiDescription | Weak |
| Usgs Dyfi Mmi | 3.65 |
| Usgs Dyfi Sig | 512 |
| Usgs Dyfi Tsunami | false |
| Usgs Dyfi Place | 3 km ESE of Larkfield-Wikiup, CA |
| Usgs Dyfi Types | ,dyfi,focal-mechanism,moment-tensor,nearby-cities,origin,phase-data,scitech-link,shakemap, |
| MergedSources | [{"id":"usgs_dyfi_nc75429272","source":"usgs_dyfi","severity":"low","severityValue":20.04,"timestamp":1788456807320,"latitude":38.501,"longitude":-122.715}] |
Safety Information
If you feel shaking: Drop, Cover, and Hold On. Move away from windows, heavy objects, and exterior walls. After shaking stops, check for injuries and structural damage. Be prepared for aftershocks, which can occur minutes to months after the mainshock. Follow instructions from local emergency management authorities.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens near Santa Rosa?
Calamity.live data shows a earthquake event with CalamityScore 21/100, near Santa Rosa (United States), based on data from usgs. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.