Volcanic Eruptions at Ahyi Seamount
Reported by USGS 5 days ago.
It is the 7th strongest of the 7 detections recorded within 20 km of this point since 23 July 2026. Another comparable one was recorded here earlier the same day.
What the source measured
USGS reported: NMI Ahyi Seamount YELLOW/ADVISORY - No signs of unrest in satellite images or distal geophysical data this past week.
USGS moved the alert level from UNASSIGNED to ADVISORY.
Nearby, since 23 July 2026
- August 27, 2026 · score 20 · 0.0 km
- August 20, 2026 · score 20 · 0.0 km
- August 13, 2026 · score 20 · 0.0 km
How we know
One source: USGS. Not yet confirmed by a second, independent source.
Our own score for this event is 18 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 v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Volcanic Eruptions |
| Severity | Medium |
| Calamity Score (ours) | 18 / 100 |
| Our confidence | 62% |
| Coordinates | 20.4370, 145.0300 |
| Nearest City | Saipan (586 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-27T23:20:59.000Z |
| Source | https://volcanoes.usgs.gov/hans2/view/notice/DOI-USGS-NMI-2026-08-27T23:20:10+00:00 |
Score Breakdown
Technical Details
| VolcanoName | Ahyi Seamount |
| VolcanoId | 284141 |
| AlertLevel | ADVISORY |
| ColorCode | YELLOW |
| ObservatoryCode | nmi |
| NvewsThreat | Very Low Threat |
| PreviousAlertLevel | UNASSIGNED |
| PreviousColorCode | UNASSIGNED |
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. 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.
Want to know when something happens in this area?
Calamity.live data shows a volcano event with CalamityScore 18/100, at Ahyi Seamount, based on data from usgs_volcano. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.