Why Volcanoes go boom ,part deux

All right, I promised an explanation of sorts for why Kilauea occasionally violently explodes. The best idea i've heard (please note that this is merely an educated guess swiped from some smart volcanologists) is that falling rocks around the crater rim trigger the eruptions. There is an active lava surface a few hundred meters below the rim, not exactly sure as it certainly fluctuates. Anyways, the surface of the lava tends to crust over, which seals in gases that would enjoy bubbling out of the lava. The rocks tumble down and bust through the crust, which all of a sudden releases a huge amount of pressure, resulting in an explosion of pulverized lava crust (seen as ash) and gas.

Any questions?

As far as pic's go, I'm currently working on a sweet volcano photo album, complete w/ witty comments about the poor fool about to get overrun by the advancing flow...