Just after midnight this morning, tiltmeters at Kīlauea's summit started recording a sharp deflationary tilt. An interesting sequence of seismic tremor and very long-period earthquakes started about an hour later. Lava lake level started to drop shortly after that, accompanied by vigorous spattering. The lake level stabilized within a few hours, and the lake is currently showing normal circulation patterns with occasional spattering.
This graph shows the radial tilt at Uwekahuna (UWE), on the northwest rim of Kīlauea's caldera, and Puʻu ʻŌʻō (POC), on the north flank of Puʻu ʻŌʻō cone, as recorded by continuously operating electronic tiltmeters. Positive changes often indicate inflation of the magma storage areas beneath the caldera, but may also result from heavy rainfall or, occasionally, instrumental malfunctions. The Y-axis is in microradians, an angular measure in parts per million; for example, one microradian represents the tilt of a 1-km-long bar, one end of which is lifted up or down 1 mm.
Data are shown for a one-week period. The electronic tilt display shows relative values rather than absolute values. In other words, we do not assign a specific value to any given time; rather, we look at the difference in tilt over a period of time (hours, days, weeks). #kilauea #hawaii #halemaumau #maunaloa #puuoo #volcano #eruption #tiltmeter #geology #deflation #lava #lavalake #spatter #hilo #kona #bigisland #explorehi #experiencehi #myhawaii #instahawaii