Articles | Volume 10, issue 3
https://doi.org/10.5194/se-10-637-2019
https://doi.org/10.5194/se-10-637-2019
Research article
 | 
14 May 2019
Research article |  | 14 May 2019

Migration of reflector orientation attributes in deep seismic profiles: evidence for decoupling of the Yilgarn Craton lower crust

Andrew J. Calvert and Michael P. Doublier

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Short summary
Deep (> 40 km) seismic reflection surveys are acquired on land along crooked roads. Using the varying azimuth between source and receiver, the true 3-D orientation of crustal structures can be determined. Applying this method to a survey over the ancient Australian Yilgarn Craton reveals that most reflectors in the lower crust exhibit a systematic dip perpendicular to those in the overlying crust, consistent with lateral flow of a weak lower crust in the hotter early Earth 2.7 billion years ago.