Caught on camera–a volcano erupting

Another stumble-upon footage and animation of a volcano eruption of the Sarychev Volcano as seen from the international space station (ISS). Is shows an animation, made of several photos shot during a fly-by of the ISS. I’m curious which techniques they used to create such an animation, since it is not a simple frame-by-frame animation of the individual pictures… so if anyone has some ideas

For now, just watch and awe…

Sarychev Volcano