Volcano Watch: Tilt measurements still vital to volcano monitoring after more than a century
By Hawaiian Volcano Observatory | Saturday, September 9, 2023, 12:05 a.m.
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Graph of tilting at Uekahuna bluff—at the summit of Kilauea—in a direction toward and away from Halemʻaumʻau, collected by a water tube tiltmeter (black) and an electronic tiltmeter (grey). Major intrusions and eruptions are marked by blue and pink arrows respectively. (Courtesy photo/USGS plot)
A water tube tiltmeter. The tiltmeter is read by looking into the portal on each pot and adjusting the sight until two pins appear to touch. In fact, one of the pins is a reflection, so having the pins almost touch establishes the exact water level within the pot. The difference in water level gives the tilt, and repeated measurements give changes in tilt over time. (Courtesy/photo)