The model of the study site (IMAGE) Hokkaido University Caption The model of the study site in July 2017, showing the positions of the sensors at different locations and depths (Evgeny A. Podolskiy). Credit Evgeny A. Podolskiy Usage Restrictions This image is copyrighted but may be used to report this press release if credited as instructed. 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.