Zenisu, Volcanic island in Kozushima, Japan.
Zenisu is a volcanic island in the Philippine Sea and part of the Izu Islands chain. It features steep cliffs and rock formations shaped by tectonic movements beneath the ocean floor.
The island formed through uplift events during the Holocene period starting about 2000 years ago. Geological evidence shows the landmass rose in several distinct phases over this time.
Marine researchers study the island's emerged marine assemblages and geological patterns to understand the seismic behavior of the northern Philippine Sea Plate.
The island is uninhabited and located far offshore, making visits difficult and restrictive. Only research expeditions with official permits can reach the site.
Scientists monitor with tide gauges and GPS systems and record that the island rises about one centimeter each year. This ongoing uplift is among the fastest known rates of its kind in Japan.
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