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Subduction Top to Bottom 2

Guest editors: Gray E. Bebout, David W. Scholl, Robert J. Stern, Laura M. Wallace, and Philippe Agard

From top-to-bottom, many geological, geophysical, petrologic/geochemical, and theoretical advancements have been made toward understanding subduction zone processes and dynamics. There could be huge value in increasing the number of novel collaborative combinations of the disparate techniques aimed at the same subduction-related processes. This themed issue, a follow-up to the Bebout et al.’s Subduction: Top to Bottom (American Geophysical Union, Geophysical Monograph v. 96), aims to provide assessments of recent advancements and the most promising future directions for subduction zone research, in part synthesizing our current understanding of subduction-related hazards (volcanic eruptions, earthquakes, and tsunamis).

To read more about this project, go to Twenty Years of Subduction Zone Science: Subduction Top to Bottom 2 (ST2B-2): GSA Today, v. 28, no. 2, p. 4-8, 


Contributions are listed under science categories for the themed issue.

Subduction zone science categories

What goes in (seafloor lithosphere and sediment, seamounts and aseismic ridges)

Forces driving subduction—thermal and geodynamic modeling

Getting started (subduction initiation)

Outer rise (slab bending, deep hydration of slabs)

Shallow forearc dynamics (initial dewatering and diagenesis, fluids, accretion, erosion)

Deformation processes and physical conditions on the subduction interface (from the seismogenic zone to the source of episodic slow slip and tremor)

Upper plate faulting and vertical deformation processes over varying time scales

Into the pressure cooker (metamorphism, fluid-rock interactions, records of deep underplating and exhumation, nature of the deep subduction interface)

Forearc to subarc mantle wedge and sub-slab mantle

Subduction zone magmatism (models for evolution, petrology, geochemistry, and isotopes; evolution of batholiths)

Explosive volcanic hazards

Geochemical and seismological expressions of deep subducted slabs

Backarc basins, cross chains, and fold-and-thrust belts

Resource implications

Crust formation at convergent margins (ocean-ocean and ocean-continent)

Convergent margin education and outreach

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