Abstract
It is often suggested that heat flow in the incoming plate at subduction
zones is lower than expected for crust of that age due to increased
hydrothermal circulation from flexure (extending about 300 km seaward
of the trench) and faulting (observed starting about 50-75 seaward
of the trench). Testing this suggestion using global heat flow data
shows no significant difference between heat flow near the trench
and the global means for the same age crust. However, on average,
heat flow in the overriding plate is about 60% of that in the incoming
plate.
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