This movie shows a draining event in the lava pond within the Halema`uma`u vent cavity. The lava column exhibited cycles of filling and draining of the vent cavity, with each cycle lasting a few minutes. As the pond drains, lava cascades into a small hole on the east side (right) of the cavity floor. Also, lava that was covering a large bench to the west of the main pond drains back, with large plates of crust sliding over the edge.

Learn more about this volcano and other Hawaiian volcanic activity at the USGS Hawaiian Volcano Observatory website. (http://hvo.wr.usgs.gov)