The image above is a plot of the number of earthquakes through time. The size of the circle is proportional to the magnitude; the colour indicates depth. What is immediately obvious is this pattern of regular large (~M5.3) events at an even spacing in time. These events are the collapse/explosion events that have been happening at the Kilauea Summit.
After the lava lake in Halemaumau crater drained, the whole area began to collapse. This collapse has taken on a fairly regular pattern: lower levels of seismicity ramping up to around 30-40 earthquakes an hour and then a collapse every 24-30 hours.
When a collapse happens, the area slides down and hits the shallow magma reservoir, triggering an explosion. However, there is one more interesting feature of these collapse events. It also sends a wave down the whole system, and about 1.5-2 hours later there is a short-lived increase in flow at Fissure 8.
You can see an animation of the collapse here: https://volcanoes.usgs.gov/observatories/hvo/multimedia_uploads/multimediaFile-2443.gif
Also, a recent digital elevation model of the summit here: https://volcanoes.usgs.gov/observatories/hvo/multimedia_uploads/multimediaFile-2447.mp4