Seismic velocities and anisotropy - single crystal plots edit page

plot 2D velocity surfaces - phase, slowness & wavefront For given plane normal direction, for example xvector, yvector or zvector Stishovite (SiO2) at high pressure

David Mainprice 1/05/2018

## The Elastic Stiffness Tensor of Stishovite

Reference: Elastic constants Stishovite, Weidner et al 1982 JGR
Reference: Crystal Structure Sinclair and Ringwood 78 Nature P422
d=4.2901

## Select the two S-waves (Vs1 and Vs2 where Vs1>Vs2 in velocity)

by the orientation of the polarization vectors ps1 and ps2 with respect to the specimen Z direction. So that sv (v=vertical) is S-wave with polarization closest to Z sh (h=horizontal) has the polarization closest to the plane normal to Z Both polarizations pairs (sv and sh) and (ps1 and ps2) are orthogonal

which values to switch this defines a function which is either one or zero