The Havre Seamount volcano produced the largest-known deep ocean volcanic eruption on Earth . The volcano erupted in July 2012 but remained unnoticed until enormous pieces of pumice were seen to be floating on the Pacific Ocean . Blankets of rock reached a thickness of 5 meters . Most of this floating pumice is deposited on the North-West coast of New Zealand and the Polynesia islands
erupted in July 2012
2012 Kermadec Islands eruption
Pumice