A review of palaeo-tsunamis for the Christchurch region, New Zealand

摘要: Abstract Recent earthquake activity in and around the Christchurch region, New Zealand, has raised concerns about tsunamis inundating coastline. While occurrence of historical is well documented, information palaeo-tsunamis poorly understood. This review draws together data from numerous sources to outline our current understanding for region. Six probable one possible Holocene are identified proxy summarised with reference all potential near-contemporaneous sites throughout Zealand. The events cover a period 6500 years, occurring 6250–6500 yr BP, 4800–5350 yr BP, 4050–4450 yr BP, 3400–3700 yr BP, 2200–2300 yr BP, 1250–1350AD 1604AD. relative exposure city however, fluctuated over time. most notable past 2000 years or so since Brighton spit extended south close off bay, then retreated formed again causing Avon-Heathcote Estuary (Ihutai) change open closed bay estuary. extent tsunami hazard therefore controlled certain by presence absence spit, which turn governed interactions between seismic fluvial processes. Potential palaeo-sources vary local (subduction fault rupture, nearshore submarine landslide, gas hydrate release, seamount flank collapse) distant ruptures Central South America) candidates. In cases more than source was each palaeo-tsunami. However, it appears that likely if not were America as opposed alternatives. identification largely based upon historically-documented palaeoseismic research such almost entirely limited known ruptures. A other tsunamigenic reveals additional candidates need be investigated detail.