Heidrun Kopp coauthored seismic refraction surveys of the O'Higgins Seamount Group and Juan Fernández Ridge. Wide-angle arrivals constrain the structure of an oceanic ridge approaching an Andean subduction zone.[ref]
Seismic investigations of the O'Higgins Seamount Group and Juan Fernández Ridge by Heidrun Kopp and others. Abstract: crossed seismic profiles, limited crustal thickening and hydration interpretation
The study tests whether extra crust alone supplies enough slab buoyancy to explain shallow subduction. Seismic speeds also depend on hydration and material composition, making the relation between the mapped ridge and the descending plate a physical interpretation rather than a purely geometric one.
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