NMI Ahyi Seamount YELLOW/ADVISORY - Submarine plumes seen in satellite data reflecting volcanic unrest or undersea eruption. Change of Aviation Color Code to YELLOW and Volcano Alert Level to Advisory.

Jul 16, 2026 00:13 - Signs of unrest at Ahyi Seamount have been observed in recent satellite images over the past few weeks.

Small plumes of discolored water were observed drifting less than 0.3 miles (0.5 km) away from the volcano in satellite images on July 1, 7, and 11.

Small plumes have been observed intermittently in clear satellite images over the last few months, but recent images show more discrete plume shapes suggesting more vigorous activity. No significant activity has been detect...

Severity

Moderate (2/5)

This month

1st Volcanic activity alert at severity 2+ in the last 30 days