Moderate Volcanic Activity ● Active
Ahyi Seamount — Volcano Alert Level ADVISORY
Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.
Measurements
| Coordinates | 20.4370, 145.0300 |
|---|---|
| Region | Northern Mariana Islands |
| Alert Level | ADVISORY |
| Aviation Colour Code | YELLOW |
| Volcano Number | 284141 |
| Observatory | Northern Mariana Islands |
| Severity Note | Severity is the US Geological Survey own Volcano Alert Level. |
Official source
Volcano alert levels courtesy of the U.S. Geological Survey Volcano Hazards Program
This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.
Severity as published by USGS Volcano Hazards Program.
View original reportThis event as JSON · API and licence
Source updated 11 minutes ago (Oct 19, 2026 18:47 UTC) · we last heard from USGS Volcano Hazards Program 11 minutes ago
On a slow connection? Low-bandwidth version — no map, no scripts, under 14 KB.
What has changed
- Reopened by the source — Oct 1, 18:01 UTC by USGS Volcano Hazards Program
- Status changed from Monitoring to Active — Sep 18, 10:33 UTC by USGS Volcano Hazards Program
Figures published in the first minutes of an event are preliminary. A change here is the agency refining its own estimate, not a correction to this page.
Satellite view, before and after
The latest clear Sentinel-2 pass before this event and the earliest one after it.
11 Oct 2026, 5 days before this event. 26.9% cloud across the tile.
16 Oct 2026, the same day, after the event was reported. 29.5% cloud across the tile.
The white ring marks where the event was reported.
Each image is a preview of a whole Sentinel-2 tile — an area of roughly 110 by 110 km, where one pixel is about 320 metres — not a close-up of the event, which may be a small part of it. "Clear" means under 30% cloud across the entire tile, so the exact place that matters can still be hidden. These are pictures for context, not an assessment of damage.
Contains modified Copernicus Sentinel data 2026, found through the Earth Search catalogue (Element 84) and served from the AWS Open Data Sentinel-2 archive.
Official authorities in United States
If you are there, these are the bodies whose instructions apply. This site is not an emergency service and does not issue warnings.
More for United States →What to do
Follow the instructions issued by USGS Volcano Hazards Program and your local emergency services. The guidance below is background.
Ashfall protection, exclusion zones, lahars and pyroclastic flows, and evacuation planning near active volcanoes.
Open Volcano Safety Guide →Nearby & related events
Disclaimer: figures are automatic feeds from the named agencies and may be revised. Do not use this page for life-safety decisions — follow official local emergency services.