The largest compositional discontinuity within the Earth is the core-mantle boundary (CMB),
at a depth of 2889 km. This boundary and the adjacent transition zones in the lowermost …

Regional body wave and surface wave studies indicate that there is a low‐Q upper mantle
layer underlying a high‐Q lithosphere. Great circle surface wave attentuation is used to …

Body wave, surface wave, and normal mode data are used to place constraints on the
frequency dependence of Q in the mantle. With a simple absorption band model it is …

Seismic waves have long been known to attenuate at a rate greater than that predicted by
geometric spreading of their wave fronts. Knopoff (1964) pointed out more than four decades …

In contrast to the liquid outer core, the earth's inner core is mostly solid, and its composition
is more pure iron. Based on dynamic arguments related to the freezing process of the inner …

Free oscillation and body wave data are used to construct average Q models for the earth.
The data set includes fundamental and overtone observations of the radial, spheroidal and …

The observations of the periods of free oscillation of the Earth provide direct constraints on
the density distribution in the Earth. These in turn allow constraints to be placed on the size …

The first part of this article gives new travel-time data for the phase PKiKP at subcritical
distances (Δ< 110°) obtained at the Warramunga array in Northern Australia. A compilation …

Differential waveform analysis provides an excellent tool for studying the attenuation
properties of the top of the inner core. We analyse 108 PKP (BC) versus PKP (DF) …

The inner core boundary (ICB) of the earth is characterized by a discontinuous change in
elastic properties between the liquid outer and solid inner core. In the ray theory …