June 24, 2026 — Rainbow frames sulfur deposits on Halemaʻumaʻu rim, Kīlauea summit

A rainbow (ānuenue) frames altered and sulfur-coated tephra on the rim of Halemaʻumaʻu crater at the summit of Kīlauea. These deposits often form in between lava fountaining episodes in Halemaʻumaʻu, as degassing and heat release continues. During lava fountaining episodes, new deposits coat the crater rim and bury the existing ones. After the lava fountaining episode ends, degassing and heat release continues and the deposits re-form. USGS photo by K. Mulliken.