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Reference #1 Editor’s summary Abstract Supplementary Materials References and Notes eLetters (0) Information & Authors Metrics & Citations Check Access References Figures Tables Media Share This article has 0 eLetter . Editor’s summary Knowing when a megathrust has relocked after an earthquake requires long-term tracking of ground motion. This can be challenging for offshore events, for which deep seafloor monitoring is scarce. Using Japan’s ambitious geodetic network, Tomita et al.
Using a 3-D numerical thermal model, we investigate the thermal structure of the Kanto region of Japan where two oceanic plates subduct. In a typical subduction setting with one subducting slab, the motion of the slab drives solid-state mantle flow in the overlying mantle wedge, bringing in hot mantle from the back-arc towards the forearc.
The Explorer segment of northernmost Cascadia is an end-member “warm” subduction zone with very young incoming plate and slow convergence rate. Understanding the megathrust earthquake potential of this type of subduction zone is of both geodynamic and societal importance. Available geodetic observations indicate that the subduction megathrust of the Explorer segment is currently locked to some degree, but the downdip extent of the fault area that is potentially seismogenic is not known.
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