Slip rates for the Hyde and Dunstan Faults, southern New Zealand, revealed by cosmogenic radionuclide dating

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dc.contributor.authorGriffin, Jen_AU
dc.contributor.authorStirling, Men_AU
dc.contributor.authorWilcken, KMen_AU
dc.contributor.authorBarrell, Den_AU
dc.contributor.authorSimon, KJen_AU
dc.date.accessioned2023-01-19T00:06:45Zen_AU
dc.date.available2023-01-19T00:06:45Zen_AU
dc.date.issued2021-11-17en_AU
dc.date.statistics2022-06-03en_AU
dc.description.abstractReverse faulting in Otago, southern New Zealand, accommodates distributed tectonic convergence on the eastern side of the Australia-Pacific plate boundary. Paleoearthquake records from some of the faults in the region show highly variable earthquake recurrence times, and this work is focused on providing longer term context to these records. We use 10Be cosmogenic radionuclide dating of alluvial fan surfaces to characterise late Quaternary slip rates on two significant faults within the system, the Hyde and Dunstan faults. We determine a slip rate of 0.29 mm/yr (0.24 – 0.37 mm/yr at 95% confidence) for the Hyde Fault since 115 ka and a slip rate of 0.17 mm/yr (0.15 – 0.23 mm/yr 95% confidence) for the Dunstan fault since 320 ka. The lower rate for the Dunstan Fault, which has greater total displacement and is closer to the plate boundary, supports a hypothesis of migration of the deformation front eastward from the plate boundary. Both faults show deviations from a constant linear slip rate through time, with slip rates varying by a factor of 2 – 4 over timescales of 15 – 80 kyr. Increases in slip rate are out of phase on the two faults, supporting a hypothesis that strain is shared within the fault system over timescales on the order of 10s – 100s kyr; however, neither fault shows evidence for long periods of seismic quiescence. © The Authorsen_AU
dc.identifier.citationGriffin, J., Stirling, M., Wilcken, K., Barrell, D., & Simon, K. (2021). Slip rates for the Hyde and Dunstan Faults, southern New Zealand, revealed by cosmogenic radionuclide dating. Paper presented to the 15th International Conference on Accelerator Mass Spectrometry, ANSTO Sydney, Australia, November 15th – 19th, 2021. (pp. 98). Retrieved from: https://ams15sydney.com/wp-content/uploads/2021/11/AMS-15-Full-Program-and-Abstract-Book-R-1.pdfen_AU
dc.identifier.conferenceenddate19 November 2021en_AU
dc.identifier.conferencename15th International Conference on Accelerator Mass Spectrometryen_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate15 November 2021en_AU
dc.identifier.pagination98en_AU
dc.identifier.urihttps://ams15sydney.com/wp-content/uploads/2021/11/AMS-15-Full-Program-and-Abstract-Book-R-1.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14393en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.subjectSlipen_AU
dc.subjectSlip velocityen_AU
dc.subjectGeologic faultsen_AU
dc.subjectEarthquakesen_AU
dc.subjectNew Zealanden_AU
dc.subjectAustraliaen_AU
dc.subjectRadioisotopesen_AU
dc.subjectQuaternary perioden_AU
dc.subjectAge estimationen_AU
dc.subjectPlate tectonicsen_AU
dc.titleSlip rates for the Hyde and Dunstan Faults, southern New Zealand, revealed by cosmogenic radionuclide datingen_AU
dc.typeConference Abstracten_AU
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