The crustal component of AuSREM makes use of prior compilations of sediment thicknesses, with cross checks against recent reflection profiling, and provides P and S wavespeed distributions through the crust.

The primary information for P wavespeed comes from refraction profiles, for S wavespeed from receiver function studies. We are also able to use the results of ambient noise tomography to link the point observations into national coverage.

Density values are derived using results from gravity interpretations with an empirical relation between P wavespeed and density.

P wavespeed distribution for the AuSREM crustal model at: 5, 15, 25 and 35 km depth. Refraction constraints are indicated by squares and receiver functions information by diamonds.

The AusCrust is now available for download. For further information please email

AusCrust paper

Last updated 14 August 2018