Abstract
Geophysics The asthenosphere is a weak layer in the Earth that allows the rigid plates of Earth's crust to move over geologic time. Hawley et al. found an unexpectedly large accumulation of a weak material just beneath the rigid Juan de Fuca slab in the Cascadia subduction zone, located along the northwestern coast of the United States. Seismically imaging this “roll” of weak material required the use of both onshore and offshore seismometers. The roll appears to be positioned underneath where the Juan de Fuca plate bends and plunges into the mantle, providing potential explanations for several puzzling features of this and other subduction zones. Science , this issue p. [1406][1] [1]: /lookup/doi/10.1126/science.aad8104
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