31. Irruputuncu displays vigorous fumarolic activity that occupies about half the summit crater and is visible within several. 32. This edifice is the currently active one, with the deepest of its three summit craters being active. 33. These all have summit craters and provided lava flows for the plains south of the You Yangs. 34. It has a main summit crater about in diameter which sometimes contains crater lakes, and a secondary crater. 35. Melting snow and ice, intense rainfall or the breakout of a summit crater lake can all generate lahars. 36. A wide and deep acidified summit crater lake at Chiginagak formed after November 2004 and before May 2005. 37. By 2008, the summit crater had cooled enough to have begun to have accumulated significant amounts of snow again. 38. They extend from the summit craters , although none of them appears to be associated with the currently active crater. 39. Its summit crater is thought to possibly contain an active lava lake, one of only a handful in the world. 40. It caused noticeable changes in the morphology of the volcano, including the formation of a new fracture along the summit craters .
