3-Dimensional Image of the Lower Crust Under an Intra-Continental Basin in Eastern Australia

Abstract

Seismic investigations of deep crustal features under the central Eromanga Basin in eastern Australia were conducted during 1980?82 and these provided a network of seismic reflection traverses with, in some places, coincident wide-angle reflection and refraction traverses (Fig. 1). This network enables a new insight into deep structures under a major intra-continental sedimentary basin on a scale not commonly available in other parts of the world, and at the intersection points of traverses the 3-dimensional structure of deep features can be examined. Generally, reflection profiling data provide deep structural information and the wide-angle reflection and refraction data provide complementary velocity information which is required to evaluate possible rock compositions at depth.