Subduction zones drive plate tectonics, regulate long-term climate through deep volatile cycling. Understanding subduction is fundamental to understanding how the planet works as a system. Southwest Pacific is the ideal laboratory to study the full-spectrum of the subduction processes (subduction initiation, intermediate-deep earthquake, plume-slab interaction, polarity reversal, eclogite exhumation) in a complex plate boundary zone. Recent marine geophysics survey provided new data in these regions. In the meantime, new development in data analysis using AI or new numerical simulations framework provide a unique opportunity to revise our knowledge on subduction processes.

This session aims to discuss the SW Pacific subduction zones from a multi-disciplinary approach (geophysics, geochemistry, geomorphology, numerical modelling) to attempts to reconcile observations from different fields. We invite contributions from colleagues working on Papua New Guinea, Matthew-Hunter zone, Vanuatu, Tonga-Samoa-Lau basin, Kermadec subduction zone or Puysegur trench.

• DI - Study of the Earth's Deep Interior
• NH - Natural Hazards
• T - Tectonophysics
• V - Volcanology, Geochemistry and Petrology