A submarine volcanic eruption detected near Papua New Guinea in May 2026 has begun producing pumice rafts that scientists expect could drift toward the Admiralty Islands in coming months. Satellites captured the initial eruption on May 8 in the Bismarck Sea, revealing steam and ash plumes alongside discolored water near the eruption site. The underwater volcano continued erupting through mid-June.
Researchers believe the activity occurs along the Titan Ridge, though the ocean floor bathymetry in this region remains poorly mapped. The eruption could potentially generate a temporary island as volcanic material accumulates, though such formations typically erode and sink within years or decades.
Pumice, a porous volcanic rock, floats readily on seawater and can travel vast distances. These floating rocks often form biological rafts, transporting marine organisms, coral larvae, and other species across ocean basins. Previous pumice rafts from Pacific volcanic eruptions have traveled thousands of kilometers, reaching shores from Hawaii to Australia.
The Bismarck Sea lies in a volcanically active zone where the Pacific Plate subducts beneath the Bismarck Plate. Multiple submarine volcanoes exist in this region, though systematic monitoring remains limited due to remote location and challenging observation conditions. The eruption's ongoing nature as of mid-June indicates sustained volcanic activity, distinguishing this event from brief, isolated events.
Scientists monitoring the situation face inherent challenges. Limited baseline data on the Titan Ridge means characterizing eruption intensity and forecasting the exact trajectory of pumice rafts remains difficult. Ocean currents and wind patterns will determine whether pumice reaches the Admiralty Islands or disperses across the broader Bismarck Sea.
If substantial pumice reaches inhabited areas, local populations could experience environmental and economic impacts. Pumice influxes can damage fishing gear, disrupt marine ecosystems temporarily, and