Transient stripping of subducting slabs controls periodic forearc uplift

• DOI: 10.1038/s41467-020-15580-7
• Publication Date: 2020-04-14T10:02:56Z
• Authors: Armel Menant; Samuel Angiboust; Taras Gerya; Robin Lacassin; Martine Simoes; Raphael Grandin
• Keywords: Forearc

Abstract Topography in forearc regions reflects tectonic processes along the subduction interface, from seismic cycle-related transients to long-term competition between accretion and erosion. Yet, no consensus exists about topography drivers, especially as contribution of deep remains poorly constrained. Here, we use thermo-mechanical simulations show that transient slab-top stripping events at base crust control uplift-then-subsidence sequences. This 100s-m-high topographic signal with a Myr-long periodicity, mostly inaccessible geodetic geomorphological records, nature influx rate material involved process. The protracted succession eventually results pulsing rise large, positive coastal topography. Trench-parallel alternation highs depressions active margins worldwide may reflect temporal snapshots different stages these surface oscillations, implying 3D shape enables tracking associated plate-interface frictional properties space time.