Volcanic Eruptions at Ahyi Seamount
Right now
The most recent data we hold from USGS arrived 74 minutes ago, and this point is in it.
Nothing else has been detected within 20 km in the last 24 hours.
Reported by USGS today.
It is the strongest of the 9 detections recorded within 20 km of this point since 23 July 2026. The last comparable one was on 3 September 2026. One more was recorded here in the fortnight before it.
What the source measured
USGS reported: NMI Ahyi Seamount YELLOW/ADVISORY - Faint water discoloration seen in satellite images; no significant geophysical signals.
USGS moved the alert level from UNASSIGNED to ADVISORY.
Nearby, since 23 July 2026
- September 3, 2026 · score 18 · 0.0 km
- August 27, 2026 · score 18 · 0.0 km
- August 27, 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 24 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) | 24 / 100 |
| Our confidence | 62% |
| Coordinates | 20.4370, 145.0300 |
| Nearest City | Saipan (586 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-10T23:25:53.000Z |
| Source | https://volcanoes.usgs.gov/hans2/view/notice/DOI-USGS-NMI-2026-09-10T23:17:05+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.
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