Determining annual layering in ice cores is a difficult, but crucial component of paleoclimate studies. We present ultrasonic tomography toward an additional tool to determine variations in (thermo-)elastic properties of ice, related to annual layering. These variations can be the result of seasonal changes in precipitation, ice chemistry and temperature. Our non-contacting and non-destructive method is tested on lab-manufactured ice and a sample ice core from the South Pole, Antarctica. While the ice is kept in a cold chamber with optical windows, scanning lasers excite and detect ultrasonic waves transmitted through the ice core. We observe variations in the vertical component of the elastic waveforms along the core: drops in the correlation between adjacent waveforms signify layer boundaries, most of which are confirmed using a back-lit photograph of the ice.