= Seismic lithosphere-asthenosphere boundary
A seismically inferred transition associated with the base of the <lithosphere>, often identified by a decrease in <shear-wave velocity>. Its depth and sharpness constrain combinations of <temperature>, composition, hydration, <melt fraction> and <seismic anisotropy>. A sharp discontinuity inside a <craton> can instead lie within its thick <lithospheric mantle>.<A global view of the lithosphere-asthenosphere boundary by Catherine A. Rychert and Peter M. Shearer>[Abstract and pp. 495–498, distinction between a sharp imaged interface and the possibly deeper cratonic boundary.]{ref}
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