September 25, 2025 — Measuring changes in elevation across the new tephra cone at Kīlauea after episode 33

A USGS Hawaiian Volcano Observatory geologist surveys the elevation along a transect across the new tephra cone formed by the recent lava fountaining episodes at the summit of Kīlauea. Repeat measurements across the same set of points have been done after every episode starting with episode 23, to track the growth and changes of the tephra hill. USGS photo by M. Decker.