Anja Moebis

Doctor of Philosophy, (Earth Science)
Study Completed: 2011
College of Sciences

Citation

Thesis Title
Understanding the holocene explosive eruption record of the Tongariro Volcanic Centre, New Zealand

Read article at Massey Research Online: MRO icon

The research of Ms Anja Moebis was focused on the Holocene history of explosive eruptions of the Tongariro Volcanic Centre. Anja established a high-resolution stratigraphic record of the eruption and repose periods of Ngauruhoe, Red Crater and Ruapehu by untangling complex, multi-source sequences in sub-aerial and lacustrine sediments. She developed a robust geochemical fingerprinting method that allowed her to trace for the first time razor-thin volcanic deposits to their source volcanoes. This method provided the base to derive the eruption frequency and magnitude distributions for each volcano. For Ngauruhoe, where the established eruption record constitutes the entire evolution of the volcano, Anja was able to demonstrate that the frequency and magnitude of eruptions follow regular temporal pattern. These are largely controlled by the ascent and crustal contamination of new magma batches. The recognition of this time-variant behavior provides the key to forecast the probability of future eruptions and to constrain their potential hazard.

Supervisors
Professor Shane Cronin
Professor Vincent Neall
Associate Professor Bob Stewart
Professor Karoly Nemeth
Associate Professor Ian Smith

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