globalchange  > 气候变化与战略
DOI: 10.1038/s41561-021-00692-6
论文题名:
Calibrating the marine turbidite palaeoseismometer using the 2016 Kaikōura earthquake
作者: 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.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期:3
起始页码: 161
结束页码: 167
语种: 英语
英文关键词: coseismic process ; earthquake ; ground motion ; paleoseismicity ; sediment core ; subduction ; turbidite ; Hikurangi ; New Zealand ; New Zealand ; North Island ; Northland
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169766
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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

Recommended Citation:
Howarth J.D.,Orpin A.R.,Kaneko Y.,et al. Calibrating the marine turbidite palaeoseismometer using the 2016 Kaikōura earthquake[J]. Nature Geoscience,2021-01-01,14(3)
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