Insights from the geological record of deformation along the subduction interface at depths of seismogenesis

Abstract Subduction interfaces are loci of interdependent seismic slip behavior, fluid flow, and mineral redistribution. Mineral redistribution leads to coupling between flow behavior through decreases in porosity/permeability increases cohesion during the interseismic period. We investigate this system from perspective ancient accretionary complexes with regional zones mélange that record noncoaxial strain underthrusting adjacent subduction interface. Deformation weak mudstones is accompanied by low-grade metamorphic reactions, dissolution along scaly microfaults, removal fluid-mobile chemical components, whereas stronger sandstone blocks preserve veins contain components depleted mudstones. These observations support local diffusive mass transport fabrics viscous coupling. Underthrusting sediments a crack porosity fluctuates due interplay cracking precipitation. Permanent deformation involves pressure solution slip, hardening, development new shears undeformed material. In contrast, coseismic may be accommodated within observed narrow cataclastic at top many terranes. A kinetic model implies changes physical properties less than hundreds years, numerical couples an earthquake simulator depicts zone interface governed feedbacks production, permeability, hydrofracturing, aging via During earthquake, permeability reduction followed rupture low seals drop seismogenic zone. Updip zone, there post-seismic wave higher propagates trenchward.