Volcanic Eruptions at Great Sitkin
Right now
The most recent data we hold from USGS arrived 12 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
One other detection within 20 km in the last 24 hours, <1 km from here.
Reported by USGS 108 days ago.
It is the 17th strongest of the 157 detections recorded within 20 km of this point since 7 March 2026. The last comparable one was on 27 May 2026. 13 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.
USGS moved the alert level from ADVISORY to WATCH.
Nearby, since 7 March 2026
- September 13, 2026 · score 32 · 0.0 km
- September 12, 2026 · score 32 · 0.0 km
- September 11, 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 20 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 v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Volcanic Eruptions |
| Severity | High |
| Calamity Score (ours) | 20 / 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 | 2026-05-28T18:07:47.000Z |
| Source | https://volcanoes.usgs.gov/hans2/view/notice/DOI-USGS-AVO-2026-05-28T19:49:52+00:00 |
Physical priority index · v1. 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: 2026-05-28T18:07:47.000Z.
First archived: 2026-05-29T20:18:59.912Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
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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