A scenario of geophysical events inferred to have preceded the 5.6 ka Whakatane eruption episode from Haroharo volcano

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Sherburn, S.; Nairn, I.A.; Smith, V.C. 2005 A scenario of geophysical events inferred to have preceded the 5.6 ka Whakatane eruption episode from Haroharo volcano . Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2005/30 36 p.

Abstract: Rhyolite eruptions during the ~5.6 ka “Whakatane” eruption episode occurred from multiple vents across Haroharo volcano (part of the Haroharo linear vent zone – HLVZ), within Haroharo caldera in the Okataina Volcanic Centre (OVC). Insights into the magmatic processes which occurred before and during the eruptions have been obtained from detailed geological and petrological studies of the eruption deposits. We have combined these magmatic insights with geophysical interpretations of the crustal structure of the Taupo Volcanic Zone, and Haroharo volcano, to produce a conceptual model of the volcano and the pre-eruption processes. This model, enhanced by the addition of geophysical data recently recorded from Long Valley caldera, a somewhat similar type of volcano in California, provides a framework for construction of a scenario of the geophysical events likely to be tested against the actual ~5.6 ka events, and contains some assumptions that also cannot be tested, it provides a plausible account of the precursors to be expected before a future Whakatane-type episode. (auth)