Earthquakes 169 km WSW of Nikolski, Alaska
Right now
The most recent data we hold from USGS arrived 6 minutes ago, and this point is in it.
2 other detections within 20 km in the last 24 hours, the nearest 6 km from here.
Reported by USGS today.
No stronger detection stands among the 5 recorded within 20 km of this point since 11 May 2026 — 4 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
USGS reported: 169 km WSW of Nikolski, Alaska
USGS recorded magnitude 3.9 at a depth of 111 km.
This is the lowest magnitude we have recorded at this point, over 94 readings since 17 September 2026 — the previous range was 3.9 to 4.
Nearby, since 11 May 2026
- September 17, 2026 · score 0 · 5.6 km
- September 16, 2026 · score 0 · 17.5 km
- September 17, 2026 · score 0 · 18.0 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.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. 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 |
| Legacy data-support index | 0.61/1 |
| Coordinates | 52.2260, -171.0710 |
| Nearest City | Anadyr (1535 km) |
| Urban exposure index (PEI) | 0 within 15 km |
| Impact Tier | minor |
| Timestamp | 2026-09-17T14:46:42.339Z |
| Source | https://earthquake.usgs.gov/earthquakes/eventpage/aka2026slngie |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: usgs. Occurrence: 2026-09-17T14:46:42.339Z.
First archived: 2026-09-17T15:17:18.629Z. Material modification: 2026-09-17T15:49:31.324Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-17T20:11:55.018Z · data_change
Index 0 → 0; severity low → low; version 5 → 5.
2026-09-17T20:06:33.607Z · data_change
Index 0 → 0; severity low → low; version 5 → 5.
2026-09-17T19:50:22.532Z · data_change
Index 0 → 0; severity low → low; version 5 → 5.
2026-09-17T18:45:46.478Z · data_change
Index 0 → 0; severity low → low; version 5 → 5.
2026-09-17T18:35:06.214Z · data_change
Index 0 → 0; severity low → low; version 5 → 5.
2026-09-17T18:19:05.607Z · data_change
Index 0 → 0; severity low → low; version 5 → 5.
2026-09-17T15:49:31.324Z · data_change
Index 0 → 0; severity low → low; version 5 → 5.
2026-09-17T15:22:44.695Z · data_change
Index 0 → 0; severity low → low; version 5 → 5.
Score Breakdown
Technical Details
| Mag | 3.9 |
| Depth | 111.2 |
| Tsunami | false |
| Mmi | 1.86 |
| Sig | 234 |
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.
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