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. Interpretation of deep seismic data is challenging due tothe lack of direct geological constraints from drilling and the more limitedamount of data available from 2-D profiles in comparison to hydrocarbonexploration surveys. Thus other constraints that can be derived from theseismic data themselves can be of great value. Though the origin of mostdeep seismic reflections remains ambiguous, an association between seismicreflections and crustal strain, e.g. shear zones, underlies manyinterpretations. Estimates of the 3-D orientation of reflectors may helpassociate specific reflections, or regions of the crust, with geologicalstructures mapped at the surface whose orientation and tectonic history areknown. In the case of crooked 2-D onshore seismic lines, the orientation ofreflections can be estimated when the range of azimuths in a common midpointgather is greater than approximately 20∘, but integration of theselocal orientation attributes into an interpretation of migrated seismic datarequires that they also be migrated. Here we present a simple approach tothe 2-D migration of these orientation attributes that utilizes the apparentdip in reflections on the unmigrated stack and maps reflector strike, forexample, to a short linear segment depending on its original position and amigration velocity. This interpretation approach has been applied to aseismic line shot across the Younami Terrane of the Australian YilgarnCraton and indicates that the lower crust behaved differently from theoverlying middle crust as the newly assembled crust collapsed during theLate Archean. Some structures related to approximately east-directedshortening are preserved in the middle crust, but the lower crust ischaracterized by reflectors that suggest N-NNE-oriented ductile flow.Deployment of off-line receivers during seismic acquisition allows therecording of a larger range of source-receiver azimuths and should producemore reliable future estimates of these reflector attributes.

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