Journal
NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
Volume 61, Issue 3, Pages 376-388Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00288306.2018.1499537
Keywords
Alpine Fault; c. AD 1620 earthquake; paleoseismic indicators; post-seismic river aggradation; modelled fault source
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Funding
- EQC Capapbility Fund [UC E5713]
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A c. AD1620 West Coast earthquake has been attributed to the northern and central segments of the Alpine Fault but does not match well with paleoseismic indicators or the currently understood recurrence interval of Alpine Fault ruptures. We model the landsliding and resulting river aggradation from a M-w 7.6 earthquake on a modelled reverse fault located between the central Alpine Fault and the main divide of the Southern Alps. The Waiho-Callery and Whataroa catchments are significantly more impacted by coseismic landsliding from this Southern Alps earthquake than from an Alpine Fault earthquake. The modelling suggests that the c. AD 1620 earthquake was not an Alpine Fault event, and that large earthquakes on subsidiary faults (or fault systems) can have larger localised impacts on river behaviour west of the Southern Alps than an Alpine Fault earthquake.
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