Authors / CoAuthors
Taylor-Silva, B. | Stirling, M. | Litchfield, N. | Griffin, J.D. | van den Berg, E. | Ningsheng Wang, N.
Abstract
We present the results of a paleoseismic study of the Akatore Fault in the low seismicity region of Otago, New Zealand. Two trenches reveal at least three reverse fault ruptures that are constrained to have occurred between 13,314 B.C. and 680 A.D. (antepenultimate event), 737 and 960 A.D. (penultimate event) and 1047 and 1278 A.D. (most recent event), with a single-event displacement of 1.6–2.7 m. GPR profiles and sediment analyses show that a 125 ka marine terrace is likely also only displaced by these three events, suggesting these earthquakes have ended a minimum 110,000 year period of quiescence on the fault. The fault therefore appears to exhibit strong aperiodicity of earthquake occurrence, a characteristic previously suggested for the Akatore Fault and other well-studied Otago faults. Slip rate and recurrence interval for the current active period are 0.3–2.4 mm/yr and 670–5110 years respectively, and we suggest for seismic hazard assessments in nearby Dunedin it is prudent to assume that the high rates of recent earthquakes will continue into the immediate future on the Akatore Fault.
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document
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127955
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Keywords
- ( Discipline )
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- paleoseismology
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- Akatore Fault
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
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- Otago
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- aperiodicity
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- OXCAL
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- OSL
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- Published_External
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Paper submitted to New Zealand Journal of Geology and Geophysics by GA collaborator at Otago University New Zealand. GA is junior author (undertaking PhD)
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Griffin is studying for a PhD at Otago University supported by a GA Development Grant from approx Aug 2018 for 3 years. Griffin is a junior author on this paper and supports the broader understanding of earthquake recurrence which is application to the Australian context. Paper appeared NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS 2020, VOL. 63, NO. 2, 151–167
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[-44.00, -9.00, 112.00, 154.00]
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