USGS Volcano Notice - DOI-USGS-NMI-2024-04-25T23:21:51+00:00

NORTHERN MARIANA VOLCANOES
No eruptive activity or significant unrest was detected at other Northern Mariana Islands volcanoes during the past week. 

Monitoring the volcanoes of the Northern Mariana Islands

Volcanoes of the Northern Mariana Islands are monitored using seismo-acoustic sensors on Saipan, distant seismic stations in Guam and Chichijima, Japan, hydroacoustic data from Wake Island, and by examining satellite imagery.

This level of monitoring can detect significant volcanic activity in the CNMI but cannot provide advanced warning of eruptions.

Due to a lack of geophysical monitoring on any of the volcanic islands, Anatahan and Sarigan volcano alert levels are designated UNASSIGNED. Other volcanoes in the CNMI including Farallon de Pajaros, Supply Reef, Maug, Asuncion, Agrigan, Pagan, Almagan, and Guguan are not seismically monitored and are also normally designated UNASSIGNED.