I just came across this cool old time-lapse video made by scientists from the US Geological Survey: The collapse of the crater floor of the Puʻu ʻŌʻō, one of the cones of the Kīlauea volcano in Hawaii.
The video, filmed on 5 March, 2011, "starts at 4am and ends at 11pm. The floor of the crater dropped about 115 metres in just a few hours."
The Puʻu ʻŌʻō has been erupting continuously since January 3, 1983, making it the longest-lived rift-zone eruption of the last two centuries.
Here's a view of this mother from afar: