Does the asthenosphere melt after an oceanic crust subducts?

No, the asthenosphere is the upper layer of the mantle, where "plastic flow" is possible, meaning that the material there is still solid but less rigid. Subducting crust doesn't melt the asthenosphere. read more

No, the asthenosphere is the upper layer of the mantle, where "plastic flow" is possible, meaning that the material there is still solid but less rigid. Subducting crust doesn't melt the asthenosphere. It's part of the subducting crust that melts. read more

Partial melting has long been suspected to occur at the base of the lithosphere where low-velocity zones are indicated by seismology (>50 km beneath young oceanic crust to >80 km beneath old crust; Eggler, 1976; Gutenberg, 1959; Leeds et al., 1974). read more