![]() ![]() ![]() Over the last two decades, co-located seismic and magnetotelluric (MT) profiles provided fundamental geophysical data sets to image the Australian crust. Elsewhere, the current Moho reflects multiple generations of crustal reworking. In a number of places a double Moho is preserved with underthrusting, suggesting that the reflection Moho is a very ancient feature (at least 1400 Ma in the Capricorn Orogen). The character of the reflection Moho varies widely across the Precambrian areas of Australia with no consistent link to the surface geology or the estimated age of the crust. This attribution to the base of the crust ties well to refraction and receiver function studies that make a more direct estimate of the depth to the base of the crust. In reflection seismology the crust is normally characterized by distinct reflectivity whose base is taken as the location of the reflection Moho. Recent extensive seismic reflection profiling provides a comprehensive data set to investigate the nature of the Moho in a wide range of geological environments. The transition between the crust and mantle across the Australian continent shows considerable variations in both depth and sharpness. ![]()
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