Lowell Miyagi and Diamond Anvil Press (image) University of Utah Share Print E-Mail Caption University of Utah geophysicist Lowell Miyagi holds a press that houses a diamond anvil, in which minerals can be squeezed a pressures akin to those deep within the Earth. Miyagi and a colleague in Germany squeezed mineral crystals in a diamond anvil under pressures like those deep underground. Their findings suggest the existence of a previously unknown layer of extremely stiff or viscous rock 930 miles underground in the top part of Earth's lower mantle. Such a layer would explain why seismic images have shown slabs from Earth's sinking tectonic plates sometimes stalling and thickening or pooling at that depth. Credit Lee J. Siegel, University of Utah Usage Restrictions None Share Print E-Mail 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.