Jonny Wu, University of Houston (IMAGE) University of Houston Caption University of Houston assistant professor of structural geology, tectonics and mantle structure, Jonny Wu, is reporting in the journal Geology,/i> that one of the most significant plate tectonic shifts in the Pacific Ocean forced a volcano chain into dormancy 50 million years ago. Credit University of Houston 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.