Volcanic Eruptions at Great Sitkin
Right now
The most recent data we hold from USGS arrived 19 hours ago, and this point is in it.
Nothing else has been detected within 20 km in the last 24 hours.
Reported by USGS today.
No stronger detection stands among the 157 recorded within 20 km of this point since 7 March 2026 — 15 others scored the same. The last comparable one was on 12 September 2026. 16 more were recorded here in the fortnight before it.
What the source measured
USGS reported: AVO Great Sitkin ORANGE/WATCH - Slow eruption of lava within the summit crater continues, accompanied by weak seismicity.
USGS moved the alert level from ADVISORY to WATCH.
Nearby, since 7 March 2026
- September 12, 2026 · score 32 · 0.0 km
- September 11, 2026 · score 32 · 0.0 km
- September 10, 2026 · score 32 · 0.0 km
How we know
One source: USGS. Not yet confirmed by a second, independent source.
Our own score for this event is 32 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 | Volcanic Eruptions |
| Severity | High |
| Calamity Score (ours) | 32 / 100 |
| Legacy data-support index | 0.62/1 |
| Coordinates | 52.0765, -176.1109 |
| Nearest City | Anadyr (1453 km) |
| Urban exposure index (PEI) | 0 within 100 km |
| Impact Tier | minor |
| Timestamp | 2026-09-13T18:56:31.000Z |
| Source | https://volcanoes.usgs.gov/hans2/view/notice/DOI-USGS-AVO-2026-09-13T18:54:33+00:00 |
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_volcano. Occurrence: 2026-09-13T18:56:31.000Z.
First archived: 2026-09-13T19:12:30.757Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-14T13:51:07.994Z · model_change
Index 32 → 32; severity high → high; version 4 → 5.
Score Breakdown
Technical Details
| VolcanoName | Great Sitkin |
| VolcanoId | 311120 |
| AlertLevel | WATCH |
| ColorCode | ORANGE |
| ObservatoryCode | avo |
| NvewsThreat | High Threat |
| PreviousAlertLevel | ADVISORY |
| PreviousColorCode | YELLOW |
Safety Information
During volcanic activity: follow evacuation orders from authorities. Volcanic ash can damage lungs — wear N95 masks or wet cloth over nose and mouth. Stay indoors during ashfall, close windows, and avoid driving. Lahars and pyroclastic flows can travel at high speeds — stay away from valleys and river channels near the volcano.
Series begins 8 March 2026 for live collection; the monthly chart also counts backfilled detections from 10 February 2024. 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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