2.1 $p$-wave tomography

hwe97p:

MIT model parameterized in terms of $2^\circ\times 2^\circ$ blocks of variable radial extent [ van der Hilst et al., 1997]. hwe97p is undefined in areas where the data coverage was considered inadequate (``gaps'').

kh00p:

Derived similarly to hwe97p but a coarser parameterization ( $3^\circ\times 3^\circ$ blocks) and additional travel time data (from ``core-phases'') has led to a model that is defined everywhere in the mantle [ Kárason and van der Hilst, 2001].

bdp98:

Harvard equal area block model BDP98 ( $5^\circ \times 5^\circ$ at the equator, constant radial extent of $\sim200$ km) [ Boschi and Dziewonski, 1999].

bdp00:

Unpublished improvement of bdp98 based on further relocation efforts [see Antolik et al., 2001].