A summit collapse 150 years ago had similarities to the 2018 collapse

  • The south caldera of Kilauea Volcano showing the main collapse area. The south Sulphur Bank is in the left side of the photo. Uekahuna Bluff, from where this photo was taken, cuts across the bottom and lower right corner of the photo. After the collapse of 1868, the caldera floor may have looked something like this. (USGS/Courtesy Photo)

The prolonged yet dramatic partial collapse of Kilauea caldera this past summer was the first to be observed in detail and the largest measured by subsidence volume of more than a dozen summit collapses in the past 200 years.