May 3, 2023 — Aerial view of Halema‘uma‘u and down-dropped block in Kīlauea caldera

Eruptions within Halema‘uma‘u over the past several years have filled the deepest part of Kaluapele (Kīlauea caldera) that collapsed in 2018, which was Halema‘uma‘u crater. However, only about 21 percent of the volume of the 2018 collapse has been filled by these eruptions—about one fifth of the volume of the 2018 collapse. Most of the volume of the 2018 collapse is in the down-dropped block to the east of Halema‘uma‘u crater, featured in the foreground of this photo. The fault scarps on the bottom and side edges of the photo outline the down-dropped block. USGS image by K. Mulliken.