Volcanic Eruptions at Shishaldin
Right now
The most recent data we hold from USGS arrived 17 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 123 days ago.
It is the 7th strongest of the 155 detections recorded within 20 km of this point since 7 March 2026. The last comparable one was on 12 May 2026. 13 more were recorded here in the fortnight before it.
What the source measured
USGS reported: AVO Shishaldin YELLOW/ADVISORY - Unrest continues with ongoing seismic and infrasound signals. Sulfur dioxide and steam emissions observed.
USGS moved the alert level from NORMAL to ADVISORY.
Nearby, since 7 March 2026
- September 13, 2026 · score 18 · 0.0 km
- September 12, 2026 · score 18 · 0.0 km
- September 11, 2026 · score 18 · 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 | Medium |
| Calamity Score (ours) | 20 / 100 |
| Legacy data-support index | 0.62/1 |
| Coordinates | 54.7554, -163.9711 |
| Nearest City | Anchorage (1094 km) |
| Urban exposure index (PEI) | 0 within 100 km |
| Impact Tier | minor |
| Timestamp | 2026-05-13T18:11:41.000Z |
| Source | https://volcanoes.usgs.gov/hans2/view/notice/DOI-USGS-AVO-2026-05-13T20:02:34+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: 2026-05-13T18:11:41.000Z.
First archived: 2026-05-14T19:09:55.229Z. 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 | Shishaldin |
| VolcanoId | 311360 |
| AlertLevel | ADVISORY |
| ColorCode | YELLOW |
| ObservatoryCode | avo |
| NvewsThreat | High Threat |
| PreviousAlertLevel | NORMAL |
| PreviousColorCode | GREEN |
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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