Graph showing Halema‘uma‘u crater floor elevation, Kīlauea volcano - week

Graph showing elevation above sea level data for the past week of Halema‘uma‘u crater, at Kīlauea volcano's summit. This data is measured with a laser rangefinder instrument that was installed on January 8, 2021. The fixed instrument continuously measures the distance to a location on the western crater floor surface, and telemeters data to HVO in real time. The raw data has been edited for this graph, with a running mean average filter of 3600 seconds. Variations in plotted depth can occur due to laser rangefinder returns on gas rather than the lava surface.

For reference, the base of Halema‘uma‘u after the 2018 collapse event was equal to an elevation of 518 meters/1699 ft above sea level. Post-eruption analyses indicate that the December 2020–May 2021 lava lake filled the base of Halema‘uma‘u to an elevation of approximately 741 meters/2431 ft above sea level (a depth of 223 meters/732 ft). The elevation of the down-dropped block is 790 meters/2592 ft above sea level (about 267 meters/876 ft above the base of the 2018 collapse).