The lithosphere–asthenosphere boundary and the tectonic and magmatic history of the northwestern United States a r t i c l e i n f o a b s t r a c t Keywords: scattered waves lithosphere lithosphere–asthenosphere boundary mid-lithospheric discontinuity This study explores the properties of the lithosphere–asthenosphere boundary (LAB) and other shallow mantle discontinuities across the diverse g...

After the 1960 M9.5 Valdivia, Chile earthquake, three types of geodetic observations were made during four time periods at nearby locations. These post-seismic observations were previously explained by post-seismic afterslip on the down-dip extension of the 1960 rupture plane. In this study, we demonstrate that the post-seismic observations can be explained alternatively by volumetric viscoelas...

Calculations of mantle convection generally use constant rates of internal heating and time-invariant core-mantle boundary temperature. In contrast, parameterized convection calculations, sometimes called thermal history calculations, allow these properties to vary with time but only provide a single average temperature for the entire mantle. Here I consider three-dimensional spherical convecti...

Various causes for mantle melting (decompression, heating or release of water) combined with current estimates of upper mantle temperatures and the state of stress in the lithosphere suggest that in many regions the asthenosphere might be partially molten, but melts may not always be able to rise to the surface. The governing equations describing melting, melt segregation, compaction and deplet...

In plate tectonic theory a weak asthenosphere is required to facilitate the motions of rigid plates. Partial melt could weaken mantle, in turn impacting convection, but date existence persistent has remained controversial. A wide range scenarios been reported terms location, amount and pathways melt. Here we use data collected by 39 ocean bottom seismometers deployed near equatorial Mid-Atlanti...