Introduction to Volcanic activity on Mercury Posted by agimarc on 2020-06-15 Posted in: Science. Tagged: Caloris Basin, flood basalts, Mercury, Messenger, Pantheon Fossae, pyroclastic, Rachmaninoff Basin, shrinkage, strange hollows. Leave a comment Perspective view looking NW over the Caloris Basin. Pantheon Fossae, radial dike swarm in the foreground. The Impact crater just offset to the right of the swarm is 41 km in diameter. Red and white are higher topography; blues are lower. Total vertical difference is 4 km. Image courtesy NASA/Johns Hopkins University Applied Physics Laboratory (JHU / APL) / Carnegie Institution of Washington/Goddard Space Flight Center Continue Reading