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Manuela Tost

Doctor of Philosophy, (Earth Science)
Study Completed: 2015
College of Sciences


Thesis Title
Linking distal volcaniclastic sedimentation and stratigraphy with the growth and development of stratovolcanoes,Ruapehu Volacano New Zealand

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Large, long-lived mountain-building volcanoes pose great risks to civilization, because they commonly collapse leading to the production of major landslides. Ms Tost''sresearch addressed fundamental questions regarding the magnitude, timing and impacts of major landslides from Mt. Ruapehu, New Zealand. She established that at least seven landslides had occurred with volumes up to 3 km3, which distributed debris over an area more than 1200 km2. Ms Tost discovered the mechanisms for why they travelled much farther than was expected, and reached over 100 km down several valleys. Ms Tost’s findings provided new geochemical and age insights into the long-term evolution of the Ruapehu volcanic system, including defining its new age at more than 340,000 years old. Furthermore, she was able to use the volcanic deposits to calculate rates of tectonic uplift in the area surrounding the central volcanic plateau of the North Island of New Zealand.

Professor Shane Cronin
Associate Professor Ian Smith
Emeritus Professor Vince Neall
Associate Professor Jonathan Procter
Professor Richard Price

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