Submarine Volcanoes Group
David Clague, Principal Investigator
The submarine volcanism group studies processes that form and modify volcanoes in the sea.
Volcanic eruptions and flank collapses are significant geologic hazards. While volcanic events and deposits in the ocean are largely concealed from view and more difficult to sample than volcanoes on land, submarine volcanoes are an integral part of the way the Earth works and may cause destructive tsunami. The roles of mid-ocean ridges in plate tectonics and hydrothermal circulation are concepts that were only discovered in the last half century. We are now learning how often the ridges erupt, how big those eruptions are and how explosive they might be, and how much they contribute to global gas and mineral cycles. Near-ridge seamounts are a special case only recently recognized: they are influenced by ridge processes but have large calderas so might be capable of especially violent behavior. Hot spot mantle plumes have built many of the thousands of seamounts and islands in the ocean, which are important for species biodiversity, fisheries and other human uses, but which can produce destructive eruptions and landslides.
Our goal is to better understand these and other volcanic processes in the deep sea environment. Through this research we hope to gain insight into potentially destructive eruptions on land or in shallow water. We are studying:
- Styles of volcanic eruptions at varying depths and lava compositions
- Frequency and volume of mid-ocean ridge eruptions
- Explosive volcanism in the deep sea
- Submarine landslides and the structure of the flanks of volcanoes
- Evolution of hydrothermal systems
- Plio-Pleistocene paleoclimatic history recorded in drowned coral reefs
- Origin and evolution of oceanic volcanoes
- Biogeography of ocean islands and submarine volcanoes