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