Volcano-tectonic interactions at the southern margin of the Okataina Volcanic Centre, Taupo? Volcanic Zone, New Zealand

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dc.contributor.authorBerryman, Kelvin
dc.contributor.authorVillamor, Pilar
dc.contributor.authorNairn, Ian
dc.contributor.authorBegg, John
dc.contributor.authorAlloway, Brent V.
dc.contributor.authorRowland, Julie
dc.contributor.authorLee, Julie
dc.contributor.authorCapote, Ramon
dc.date.accessioned2025-01-20T21:06:44Z
dc.date.available2025-01-20T21:06:44Z
dc.date.issued2022
dc.description.abstractThe c. 15 km-long Ngapouri-Rotomahana Fault (NRF) is a major splay of the Paeroa Fault at the eastern margin of the modern Taupo over bar Rift, the active tectonic structure embedded within the Taupo over bar Volcanic Zone of North Island, New Zealand. The NRF and Paeroa Fault extend to the southern margin of the Okataina Volcanic Centre (OVC) and lie southwest of the Tarawera vent lineation, which is the source of approximately half of the eruptions of the OVC in the past 25 cal. ka BP. Here, we explore volcano-tectonic relationships between the OVC and the NRF and Paeroa Fault. Collective evidence used in our analysis includes: volcanic processes interpreted as occurring during the historic 1886 Tarawera (basalt) and the prehistoric 1314 +/- 12 CE Kaharoa (basalt triggered rhyolite) eruptions, both on the Tarawera vent lineation; exposures in five trenches excavated across the NRF and seven trenches across the Paeroa Fault; data on a series of explosion craters formed to the southwest of the volcano associated with the -1314 CE Kaharoa eruption and the Rotoma rhyolite (-9.4 cal. ka BP) eruption from the OVC; and mafic dykes that primed several of the OVC eruptions. Data from the twelve trenches on the two faults reveal eight surface fault ruptures since 15.6 cal. ka BP, with most closely coinciding with volcanic eruptions, providing a first-order indication of probable causality. Three principal modes of interaction are identified. Firstly, large displacement events on the Paeroa fault, arguably immediately prior to the Mamaku and Rotoma rhyolite eruptions (-7.9 and -9.4. cal. ka BP, respectively) and on the NRF immediately prior to the -1314 CE Kaharoa eruption are candidates for earthquake static or dynamic stress triggers for those explosive eruptive events. Secondly, basalt dyke intrusion was also involved in the initiation of the Kaharoa eruption, so the spatial and temporal relationships between dyke intrusion, smaller displacement fault ruptures and initiation of the Kaharoa eruption appear closely connected. Thirdly, faulting events that are interpreted as co- or posteruption may be the result of stress triggers associated with magma chamber deflation.
dc.description.funderNew Zealand MBIE funding
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.jvolgeores.2022.107552
dc.identifier.eissn1872-6097
dc.identifier.issn0377-0273
dc.identifier.urihttps://doi.org/10.1016/j.jvolgeores.2022.107552
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93368
dc.identifier.wosidWOS:000804416400002
dc.language.isoen
dc.revistaJournal of volcanology and geothermal research
dc.rightsacceso restringido
dc.subjectNgapouri-Rotomahana Fault
dc.subjectPaeroa Fault
dc.subjectOkataina Volcanic Centre
dc.subjectTephra
dc.subjectPaleoseismology
dc.subjectVolcano-tectonic interaction
dc.subjectRhyolite eruption
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleVolcano-tectonic interactions at the southern margin of the Okataina Volcanic Centre, Taupo? Volcanic Zone, New Zealand
dc.typeartículo
dc.volumen427
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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