Woodquakes (IMAGE) Aalto University Caption Year rings show collapse as a result of the piston's compression. The images taken by the camera clearly display the year rings of the wood. Comparing two consecutive images reveals the collapse of a year ring. This is seen in the picture on the right as a dark red stripe, which signifies a large local deformation. Credit Mikko Ovaska/ Aalto University 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.