In this paper, we compare two ways of analysing resolution in AEM surveys: using the sensitivities, and using the posterior covariance matrix. We apply these to compare two response types, impulse response and step response, and to compare two AEM systems, SkyTEM and TEMPEST, for hydrogeophysically relevant models.

In regions where conductive overburden dominates the near-surface, static shifts and electrical anisotropy can present significant complications for the generation of 2D magnetotelluric resistivity models. Affecting results collected in southeastern Australia, such difficulties caused by these galvanic distortions have thus been allayed through phase tensor analysis of the data.

Common offset implementations of the generalised reciprocal method generate detailed spatially varying models of the near surface from multi-fold seismic refraction data. These models facilitate the elimination of undetectable artefacts with automatic refraction tomography, the validation of vertical velocity gradients and the convenient evaluation of large sets of traveltime data.

Microtremor array observations were conducted in Metro Manila, the Philippines, to estimate the shear-wave velocity profiles at 32 sites. The inferred shear-wave velocity profiles were utilised to compute the site amplifications with reference to the motion in engineering bedrock. Subsequently, the site amplifications were grouped based on NEHRP site classes.

New methods for inverting gradient tensor surveys, based on eigenanalysis and the normalised source strength derived from the eigenvalues, have been developed for point dipole (sphere), vertical line of dipoles (narrow vertical pipe), line of dipoles (horizontal cylinder), thin dipping sheet, and contact models.

The palaeomagnetic analysis of the Late Cambrian Cupala Creek Formation suggests that the high temperature component is primary in origin. It is inferred, therefore, that this area of the Delamerian Orogen did not record any movement or rotation since the Late Cambrian and can be considered as part of Gondwana.