March 4 overflight of Kīlauea summit and East Rift Zone

Subtle steaming was visible at Pu‘u ‘Ō‘ō during HVO's overflight of Kīlauea on March 4, 2021. Steam is normally visible as the vent—which was active for more than 35 years—continues to cool, following the 2018 Pu‘u ‘Ō‘ō collapse. The brown-colored tephra deposits (right) are from the high-fountaining phases early in the Pu‘u ‘Ō‘ō eruption, whereas the silver-grey lava overflows (left) later resurfaced the side of the vent. USGS image by K. Mulliken on March 4, 2021.