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50thKaikoura05 -1- Kaikoura 2005 CHARACTERISATION OF NEW ...

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pyroclastic activity starts generating long-runout<br />

massflows. Edifice growth is ultimately limited to<br />

a critical point at which it fails. Past cones were<br />

probably similar to the current edifice, built<br />

primarily from voluminous unconsolidated<br />

pyroclastic deposits, making them susceptible to<br />

large-scale, deep-seated failures. Currently we<br />

appear to be near the end of the edifice growth<br />

phase.<br />

Understanding the cyclic nature of this record,<br />

including redefining the number of cycles will be<br />

critical for developing realistic probabilistic hazard<br />

models. Forecasting models can be refined by<br />

considering not just return periods of debris<br />

avalanches but also the preconditioning of the<br />

edifice to failure, and the type and nature of other<br />

hazards at different parts of the cycle.<br />

ORAL<br />

50 th <strong>Kaikoura</strong>05 -100- <strong>Kaikoura</strong> <strong>2005</strong>

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