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      Vegetation dieback as a proxy for temperature within a wet pyroclastic density current: A novel experiment and observations from the 6th of August 2012 Tongariro eruption

      Efford, Jackson Tai; Bylsma, Rebecca Johanna; Clarkson, Bruce D.; Pittari, Adrian; Mauriohooho, Kate; Moon, Vicki G.
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      2014 efford, bylsma et al.pdf
      Accepted version, 3.469Mb
      DOI
       10.1016/j.jvolgeores.2014.05.016
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      Efford, J. T., Bylsma, R. J., Clarkson, B. D., Pittari, A., Mauriohooho, K., & Moon, V. G. (2014). Vegetation dieback as a proxy for temperature within a wet pyroclastic density current: A novel experiment and observations from the 6th of August 2012 Tongariro eruption. Journal of Volcanology and Geothermal Research, 286, 367–372. http://doi.org/10.1016/j.jvolgeores.2014.05.016
      Permanent Research Commons link: https://hdl.handle.net/10289/8925
      Abstract
      The 6th of August 2012 eruption of Te Maari (Mt Tongariro, New Zealand) generated wet pyroclastic density currents (PDCs) which caused widespread dieback of vegetation (singed, brown foliage) in their path. An absence of significant charcoal formation suggests that PDC temperatures were mostly below 250 °C. Textural evidence for liquid water being present in the matrices during emplacement (vesicles) suggests that temperatures were b100 °C. We determined a probable minimum PDC temperature using an experiment replicating the critical temperatures required to induce foliar browning in seven species affected by the eruption. In locations where all species exhibited browned foliage (or were defoliated), temperatures were probably ≥64 °C assuming a PDC duration of 60 s. In the more distal areas, where only the most susceptible species were browned while others remained healthy and unaffected, temperatures were probably around 51–58 °C. These results have relevance to volcanic hazard mitigation and risk assessment, especially on the popular Tongariro Alpine Crossing.
      Date
      2014
      Type
      Journal Article
      Publisher
      Elsevier
      Rights
      This is the authors' accepted version (article in press) for the Journal of Volcanology and Geothermal Research. © 2014 Elsevier B.V.
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      • Science and Engineering Papers [3077]
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