Reported by USGS 22 days ago.
It is the 3rd strongest of the 11 detections recorded within 20 km of this point since 8 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
USGS reported: 3 km N of San Leandro, CA
USGS recorded magnitude 3.8 at a depth of 6 km.
Nearby, since 8 March 2026
- August 13, 2026 · score 0 · 0.0 km
- August 13, 2026 · score 0 · 0.2 km
- August 13, 2026 · score 0 · 0.5 km
How we know
One source: USGS. Not yet confirmed by a second, independent source.
Our own score for this event is 0 out of 100, at 65 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Earthquakes |
| Severity | Low |
| Calamity Score (ours) | 0 / 100 |
| Our confidence | 65% |
| Coordinates | 37.7552, -122.1502 |
| Timestamp | 2026-08-13T15:30:04.700Z |
| Source | https://earthquake.usgs.gov/earthquakes/eventpage/nc75417557 |
Score Breakdown
Technical Details
| Mag | 3.84 |
| Depth | 5.55 |
| Tsunami | false |
| Felt | 7722 |
| Mmi | 4.22 |
| Alert | green |
| Sig | 607 |
| Usgs Dyfi Mag | 3.84 |
| Usgs Dyfi Depth | 5.55 |
| Usgs Dyfi Felt | 7786 |
| Usgs Dyfi Cdi | 3.8 |
| Usgs Dyfi CdiDescription | Weak |
| Usgs Dyfi Mmi | 4.22 |
| Usgs Dyfi Alert | green |
| Usgs Dyfi Sig | 607 |
| Usgs Dyfi Tsunami | false |
| Usgs Dyfi Place | 3 km N of San Leandro, CA |
| Usgs Dyfi Types | ,dyfi,focal-mechanism,losspager,moment-tensor,nearby-cities,origin,phase-data,scitech-link,shake-alert,shakemap, |
| MergedSources | [{"id":"usgs_dyfi_nc75417557","source":"usgs_dyfi","severity":"low","severityValue":23.04,"timestamp":1786635004700,"latitude":37.7551666666667,"longitude":-122.150166666667}] |
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 in this area?
Calamity.live data shows a earthquake event with CalamityScore 0/100, 3 km N of San Leandro, CA (United States), based on data from usgs. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.