Miles Bodmer coauthored onshore–offshore seismic tomography of the Cascadia subduction zone. Relative arrival delays reveal along-strike changes in mantle seismic velocity, which were compared with plate locking and episodic slip patterns.[ref]
The study proposes that buoyant material beneath the slab changes forces transmitted to the plate interface. A low-velocity anomaly supports a thermal or compositional interpretation only through an additional material and dynamical model.

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