Paleoseismology, seismic hazard and volcano-tectonic interactions in the Tongariro Volcanic Centre, New Zealand : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Earth Science at Massey University, (Palmerston North, Manawatu), New Zealand

Gómez Vasconcelos, Martha Gabriela

Paleoseismology, seismic hazard and volcano-tectonic interactions in the Tongariro Volcanic Centre, New Zealand : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Earth Science at Massey University, (Palmerston North, Manawatu), New Zealand

dc.contributor.author	Gómez Vasconcelos, Martha Gabriela
dc.date.accessioned	2018-04-11T02:11:26Z
dc.date.available	2018-04-11T02:11:26Z
dc.date.issued	2017
dc.description	Content removed from appendices for copyright reasons: Gómez-Vasconcelos, M. G., Villamor, P., Cronin, S. J., Procter, J., Kereszturi, G., Palmer, A., Townsend, D., … Ashraf, S. (2016). Earthquake history at the eastern boundary of the South Taupo Volcanic Zone, New Zealand. New Zealand Journal of Geology and Geophysics, 59(4), 522-543. doi: 10.1080/00288306.2016.1195757	en_US
dc.description.abstract	At the southern part of the Taupo Rift, crustal extension is accommodated by a combination of normal faults and dike intrusions, and the Tongariro Volcanic Centre coexists with faults from the Ruapehu and Tongariro grabens. This close coexistence and volcanic vent alignment parallel to the regional faults has always raised the question of their possible interaction. Further, many periods of high fault slip-rate seem to coincide with explosive volcanic eruptions. For some periods these coincidences are shown to be unrelated; however, it remains important to evaluate the potential link between them. In the Tongariro Graben, the geological extension was quantified and compared to the total geodetic extension, showing that 78 to 95% of the extension was accommodated by tectonic faults and only 5 to 22% by dike intrusions. Within the latter, 4 to 5% was accommodated by volcanic eruptions and 18 to 19% by arrested dike intrusions, with an unknown percentage of hybrid extension. Short-term variations in fault slip-rates and volcanic activity for the last 100 ka in the Tongariro Volcanic Centre may have been influenced by static stress transfer between adjacent faults (within <20 km from the source) and dike intrusions (within <10 km), or by fluctuations in magma input through time. The amount of magma involved in the rifting process will condition the predominant extension mechanism and thus influence the predominant type of volcano-tectonic interaction. A record of volcanic and seismic activity for the last 250 ka was assembled, from new and published studies. This was used to analyse the spatiotemporal associations between volcanic and seismic activity in the southern Taupo Rift. Data on the faulting history, slip-rate variation and seismic hazard of the Upper Waikato Stream, Wahianoa, Waihi and Poutu faults formed the core of the analysis. These faults are capable of producing a MW 7.2 earthquake with a single-event displacement of 2.9 m, posing an important hazard to the region. Data gathered in this study provides an update to the National Seismic Hazard Model for New Zealand.	en_US
dc.identifier.uri	http://hdl.handle.net/10179/13014
dc.language.iso	en	en_US
dc.publisher	Massey University	en_US
dc.rights	The Author	en_US
dc.subject	Paleoseismology	en_US
dc.subject	Earthquake hazard analysis	en_US
dc.subject	Volcanic hazard analysis	en_US
dc.subject	Tongariro (Region)	en_US
dc.subject	New Zealand	en_US
dc.subject	Research Subject Categories::NATURAL SCIENCES::Earth sciences::Endogenous earth sciences	en_US
dc.title	Paleoseismology, seismic hazard and volcano-tectonic interactions in the Tongariro Volcanic Centre, New Zealand : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Earth Science at Massey University, (Palmerston North, Manawatu), New Zealand	en_US
dc.type	Thesis	en_US
massey.contributor.author	Gómez Vasconcelos, Martha Gabriela
thesis.degree.discipline	Earth Science	en_US
thesis.degree.grantor	Massey University	en_US
thesis.degree.level	Doctoral	en_US
thesis.degree.name	Doctor of Philosophy (PhD)	en_US