Wavefield (IMAGE) University of Maryland Caption The above image shows how areas of hot, dense rock called ultralow-velocity zones deep inside the earth bend and diffract sound waves produced by earthquakes. In a new analysis of the diffracted waves recorded by seismograms, UMD geologists reveal a new ULVZ under Marquesas and a bigger ULVZ beneath Hawaii than previously known. Credit Doyeon Kim/University of Maryland Usage Restrictions None License Licensed 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.