Refining the Moho across the Australian continent

Abstract

In recent years there has been a considerable expansion of deployments of portable seismic stations across Australia, which have been analysed by receiver function or autocorrelation methods to extract estimates of Moho depth. An ongoing program of full-crustal reflection profiles has now provided more than 25,000 km of reflection transects that have been interpreted for Moho structure. The Moho dataset is further augmented by extensive marine reflection results. These new data sources have been combined with earlier refraction and receiver function results to provide full continental coverage, though some desert areas remain with limited sampling. The dense sampling of the Moho indicates the presence of rapid changes in Moho depth and so the Moho surface has been constructed using an approach that allows different weighting and spatial influence depending on the nature of the estimate. The inclusion of Moho results from continental-wide gravity inversion with low weighting helps to resolve the continent-ocean transition and to provide additional control in the least sampled zones. The refined distribution indicates the presence of widespread smaller-scale variations in Moho structure. Strong lateral contrasts in crustal thickness remain, but some have become more subdued with improved sampling of critical areas. The main differences from earlier results lie in previously poorly sampled regions around the Lake Eyre Basin, where additional passive seismic results indicate somewhat thicker crust though still with a strong contrast in crustal thickness to the cratonic zone to the west.

On the Detection of Upper Mantle Discontinuities with Radon-Transformed Ps Receiver Functions (CRISP-RF)

“…As a comparison, the CRISP-RF performs the task of removing multiples in the crust using a sparse Radon transform while a recently developed technique, FADER (Fast Automated Detection and Elimination of Echoes and Reverberations), removes repeating echoes in the shallow reverberant layers (sediments, oceans, or glaciers) using a homomorphic transform (Z. Zhang & Olugboji, 2021, 2023. Both techniques model the behavior of reverberations using appropriate transforms that separate the unwanted wavefield contribution from the signal of interest: crustal multiples (single echoes) are separated in a Radon-transformed domain while the reverberations in resonant layers (repeating echoes) are separated in a homomorphic-transformed domain.…”