At Pu‘u ‘Ō‘ō on KÄ«lauea Volcano’s East Rift Zone, the ridge separating the main crater (top) from the west pit (bottom) has been subsiding over the past several months due to small rock falls and unstable ground. As the ground shifts, cracks along the ridge and on both sides of it continue to open. The lava pond within the west pit has risen several meters (yards) in the past month, and has produced overflows (darker lava) onto the floor of the pit as it rises. A small lava flow also erupted onto the floor of the main crater on March 25 and remained active through this evening (March 27). This flow is also darker in color and is visible in this image in the foreground of the main crater floor. Photo taken Tuesday, March 27, 2018 courtesy of U.S. Geological Survey