On May 8, 2026, satellites detected signs of an unexpected submarine volcanic eruption in the Bismarck Sea near the islands of Papua New Guinea. Over the next several weeks, plumes of steam and ash streamed over the sea, and areas of discolored water surrounded the eruption site. Relatively little is known about the ocean floor in this area or the volcanic feature that is presently erupting. But experts think the new activity, ongoing as of mid-June, might be occurring along the Titan Ridge and has the potential to form an ephemeral new island.
Despite the unknowns, the effects of the eruption became unmistakable for some communities in Papua New Guinea’s Admiralty Islands. In early June, rafts of pumice drifted northwest from the eruption site and clogged up coastlines on several of the islands. Bands of the buoyant volcanic material are visible in this image, acquired with the OLI (Operational Land Imager) on Landsat 8 on June 4, as they drifted with surface currents on the Bismarck Sea.
Several days after the image, news outlets reported acute impacts from thick masses of pumice reaching coastal areas. Communities on Lou Island and Baluan Island, to the south, were described by officials as among the worst affected, according to reports from local media. Outlets reported that a layer of pumice up to several meters thick blanketed the shore, cutting off access to the water. The volcanic fragments similarly choked the coast and key waterways around the much larger Manus Island, about 125 kilometers (80 miles) northwest of the …