The Reporoa Caldera is to the east of the Paeroa Fault and south of the Ngapouri-Rotomahana Fault. It is accordingly south of the Okataina Volcanic Centre (approximate thick white border) and occupies a low land area between this and the Waikato River
The Reporoa Caldera is a 10 km by 15 km caldera in New Zealand's Taupō Volcanic Zone located in the Taupō-Reporoa Basin. It formed some 280,000 years ago,[1]: 197 in a large eruption that deposited approximately 100 km3 of tephra, forming the Kaingaroa Ignimbrite layer.[2] The ignimbrite sheet extends up to 15 km (9.3 mi) to the east.[3]
In April 2005, a large hydrothermal explosion occurred near a cow paddock within the Taupō-Reporoa Basin, destroying some trees, temporarily blocking a nearby stream and creating a 50-metre crater at 38°32′02″S176°10′19″E / 38.533832°S 176.172010°E / -38.533832; 176.172010.[4] A similar explosion happened in the area in 1948, and smaller explosions have happened in the years between.[5][4] At the time of the last eruption, it was believed to be within the caldera, but these recent eruptions are not technically within the now known area of the caldera.[1]: 197
^ abcDowns, D.T.; Rowland, J.V.; Wilson, C.J.N.; Rosenberg, M.D.; Leonard, G.S.; Calvert, A.T. (2014). "Evolution of the intra-arc Taupo-Reporoa basin within the Taupo Volcanic Zone of New Zealand". Geosphere. 10 (1): 185–206. doi:10.1130/GES00965.1.
^Nairn, I.A.; Wood, C.P.; Bailey, R.A. (December 1994). "The Reporoa Caldera, Taupo Volcanic Zone: source of the Kaingaroa Ignimbrites". Bulletin of Volcanology. 56 (6): 529–537. Bibcode:1994BVol...56..529N. doi:10.1007/BF00302833. S2CID 128947835.
^Spinks, Karl D. (2005). "Rift Architecture and Caldera Volcanism in the Taupo Volcanic Zone, New Zealand".
^ abSimpson, Mark P.; Rosenberg, Michael D.; Rae, Andrew J.; Bignall, Greg; Mountain, Bruce W.; Graham, Duncan; Chappell, Debra (2014). "Insight into the 2005 hydrothermal eruption at South Orakonui, Ngatamariki Geothermal Field, New Zealand from calcite microthermometry". Retrieved 16 October 2022.
^Geothermal eruption in New Zealand paddock leaves big crater, The Star, 20 April 2005.
The ReporoaCaldera is a 10 km by 15 km caldera in New Zealand's Taupō Volcanic Zone located in the Taupō-Reporoa Basin. It formed some 280,000 years...
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