气候变化领域集成服务门户(CCPortal): Calibrating the marine turbidite palaeoseismometer using the 2016 Kaikōura earthquake

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DOI	10.1038/s41561-021-00692-6
	Calibrating the marine turbidite palaeoseismometer using the 2016 Kaikōura earthquake
	Howarth J.D.; Orpin A.R.; Kaneko Y.; Strachan L.J.; Nodder S.D.; Mountjoy J.J.; Barnes P.M.; Bostock H.C.; Holden C.; Jones K.; Cağatay M.N.
发表日期	2021
ISSN	17520894
起始页码	161
结束页码	167
卷号	14 期号:3
英文摘要	Turbidite palaeoseismology has produced arguably the most comprehensive multimillennial scale records of subduction-zone earthquakes but is underpinned by techniques that are vigorously debated in earthquake science. Resolving this argument requires new direct observations that test the approach’s essential assumptions. Here we present measurements from turbidites triggered by the 2016 Mw 7.8 Kaikōura earthquake in New Zealand, one of the most well-instrumented earthquakes in history. This natural experiment provides an ideal test for turbidite palaeoseismology because fault source, ground motions and turbidite deposition in discrete canyons are well-resolved by analysis of sediment cores combined with physics-based ground-motion modelling. We find that the Kaikōura earthquake triggered flows in ten consecutive canyon–distributary systems along a 200 km segment of the Hikurangi subduction margin where long-period (>2 s) peak ground velocities exceeded turbidity-current-triggering thresholds between 16–25 cm s−1. Comparison between ground motions and turbidite deposition confirm that there is a predictable relationship between earthquake source, ground motions and deposition of coseismic turbidites. We demonstrate that the patterns of triggering and resultant turbidite character may preserve evidence of fault-rupture direction along with the radiating patterns and amplification of earthquake ground motions. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	coseismic process; earthquake; ground motion; paleoseismicity; sediment core; subduction; turbidite; Hikurangi; New Zealand; New Zealand; North Island; Northland
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206910
作者单位	School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand; National Institute of Water and Atmospheric Research (NIWA), Wellington, New Zealand; GNS Science, Lower Hutt, New Zealand; Graduate School of Science, Kyoto University, Kyoto, Japan; School of Environment, University of Auckland, Auckland, New Zealand; School of Earth and Environmental Sciences, University of Queensland, Brisbane, QLD, Australia; EMCOL Research Centre and Department of Geological Engineering, Istanbul Technical University, Istanbul, Turkey
推荐引用方式 GB/T 7714	Howarth J.D.,Orpin A.R.,Kaneko Y.,et al. Calibrating the marine turbidite palaeoseismometer using the 2016 Kaikōura earthquake[J],2021,14(3).
APA	Howarth J.D..,Orpin A.R..,Kaneko Y..,Strachan L.J..,Nodder S.D..,...&Cağatay M.N..(2021).Calibrating the marine turbidite palaeoseismometer using the 2016 Kaikōura earthquake.Nature Geoscience,14(3).
MLA	Howarth J.D.,et al."Calibrating the marine turbidite palaeoseismometer using the 2016 Kaikōura earthquake".Nature Geoscience 14.3(2021).