Lava Dome Collapses : Part II
When and why lava domes collapse
Eliza Calder, SUNY, Buffalo
This presentation continues with the theme of lava dome collapses, and can be viewed as a sequel to Hugh Tuffens excellent presentation on magma fracture and lava dome collapse.

 The work presented here is focused entirely on Soufrière Hills Volcano, Montserrat, but I would hope that many aspects are pertinent to activity at Colima, Merapi, Unzen, Mount St Helens and other dome forming eruptions.

The images show the results of collapses of different scales at the Soufrière Hills Volcano lava dome.
a) Incandescent rockfalls travelling down the eastern talus slope of the dome.
Photograph taken at dawn by MVO’s remote camera located on Perches Mountain, ~500 m to the southeast of dome on 19 January 2006.
b) Horseshoe collapse crater or ‘scar’ formed as a result of the massive, 12 July 2003, dome collapse, which removed 210 x 106 m3 .
Photo taken on 23 October 2003. Both photographs courtesy of MVO (http://www.mvo.ms)