Halema`uma`u vent with thermal camera

movie shows recent activity observed within the Halema`uma`u vent with a thermal camera. The video speed is approximately x30. Cycles of filling and draining of the lava lake have been observed throughout much of the past week, following a collapse in the vent on March 25. Filling-draining frequencies have ranged from about 10 to 20 cycles per hour. A brief period of steady behavior, with no significant lava level fluctuations, was observed around midday on March 28.