Satellite Image of Rift (IMAGE) University of Washington Caption Satellite images taken May 8 (left) and May 11 (right), three days apart in 2012, show a new crack that forms a “Y” branching off to the left of the previous rift. Three seismic instruments (black triangles) recorded vibrations that were used to calculate rift propagation speeds of up to 80 miles per hour. Credit Olinger et al./AGU Advances Usage Restrictions With credit 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.