April 20, 2021 — Kīlauea lava lake and rocks

A telephoto view of the southern lava lake crust and Halema‘uma‘u crater wall at the summit of Kīlauea. Many rockfalls from the steep and unstable crater walls of Halema‘uma‘u have deposited large boulders onto the stagnant lava surface over the past few months. This photo was taken from the west rim of Halema‘uma‘u looking southeast. USGS photo taken by L. DeSmither on April 20, 2021.