July 2, 2024 — Leveling the UWE tiltmeter at the summit of Kīlauea

Before the UWE tiltmeter could be leveled, sand had to removed from the six-meter-deep (20 feet) borehole housing the tiltmeter. HVO field engineers use a high-power vacuum to remove the sand, in order to access the tiltmeter. USGS image by M. Warren.