Volcanic Eruptions at Shishaldin
Right now
The most recent data we hold from USGS arrived 11 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 118 days ago.
It is the 2nd strongest of the 148 detections recorded within 20 km of this point since 7 March 2026. The last comparable one was on 10 May 2026. 14 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 emissions and steaming observed.
USGS moved the alert level from NORMAL to ADVISORY.
Nearby, since 7 March 2026
- September 6, 2026 · score 24 · 0.0 km
- September 5, 2026 · score 18 · 0.0 km
- September 4, 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, at 62 % 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 | Volcanic Eruptions |
| Severity | Medium |
| Calamity Score (ours) | 20 / 100 |
| Our confidence | 62% |
| Coordinates | 54.7554, -163.9711 |
| Nearest City | Anchorage (1094 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-11T18:24:22.000Z |
| Source | https://volcanoes.usgs.gov/hans2/view/notice/DOI-USGS-AVO-2026-05-11T20:21:35+00:00 |
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.
Want to know when something happens in this area?
Calamity.live data shows a volcano event with CalamityScore 20/100, at Shishaldin, based on data from usgs_volcano. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.