Ultra-low velocity zone (IMAGE) University of Alabama in Tuscaloosa Caption Seismic waves from earthquakes in the southern hemisphere sample the ULVZ structure along the Earth’s CMB and are recorded by sensors in Antarctica. Credit Edward Garnero and Mingming Li, Arizona State University. Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.