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Mantle circulation models with variational data assimilation: inferring past mantle flow and structure from plate motion histories and seismic tomography
SUMMARY Mantle convection models require an initial condition some time in the past. Because this initial condition is unknown for Earth, we cannot infer the geological evolution of mantle flowExpand
A sensitivity study of three-dimensional spherical mantle convection at 108 Rayleigh number: Effects of depth-dependent viscosity, heating mode, and an endothermic phase change
Mantle convection is influenced simultaneously by a number of physical effects: brittle failure in the surface plates, strongly variable viscosity, mineral phase changes, and both internal heatingExpand
Effect of depth-dependent viscosity on the planform of mantle convection
LITHOSPHERIC plate motions at the Earth's surface result from thermal convection in the mantle1. Understanding mantle convection is made difficult by variations in the material properties of rocks asExpand
Role of a low‐viscosity zone in stabilizing plate tectonics: Implications for comparative terrestrial planetology
[1] Earth's near-surface layer, its lithosphere, is broken into quasi-rigid plates that form the upper thermal boundary layer for mantle convection. Since the discovery of plate tectonics, it hasExpand
The adjoint method in seismology: I. Theory
Abstract The adjoint method is a powerful tool in geophysics that permits the computation of the exact first derivative of a physical observable or an associated objective function with respect toExpand
Low plume excess temperature and high core heat flux inferred from non-adiabatic geotherms in internally heated mantle circulation models
Abstract Heat transfer across the core mantle boundary (CMB) is fundamentally important to Earth’s internal energy budget. But the amount of heat entering the mantle from the core is poorly known.Expand
Theoretical background for continental‐ and global‐scale full‐waveform inversion in the time–frequency domain
SUMMARY We propose a new approach to full seismic waveform inversion on continental and global scales. This is based on the time–frequency transform of both data and synthetic seismograms with theExpand
Mesozoic plate-motion history below the northeast Pacific Ocean from seismic images of the subducted Farallon slab
A three-dimensional spherical computer model of mantle convection is used to show that seismic images of the subducted Farallon plate provide strong evidence for a Mesozoic period of low-angle subduction under North America. Expand
Full waveform tomography for radially anisotropic structure: New insights into present and past states of the Australasian upper mantle
article i nfo We combine spectral-element simulations and adjoint techniques in a non-linear full seismic waveform tomography for the radially anisotropic structure of the Australasian upper mantle.Expand
Full seismic waveform tomography for upper-mantle structure in the Australasian region using adjoint methods
SUMMARY We present a full seismic waveform tomography for upper-mantle structure in the Australasian region. Our method is based on spectral-element simulations of seismic wave propagation in 3-DExpand