Modern diatom assemblages from Chilean tidal marshes and their application for quantifying deformation during past great earthquakes

Modern diatom assemblages from Chilean tidal marshes and their application for quantifying deformation during past great earthquakes
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智利潮汐沼泽的现代硅藻组合及其在过去大地震期间变形量化中的应用

DOI:
10.1002/jqs.2933
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发表时间:
2017
影响因子:
2.3
通讯作者:
Hocking E
Hocking E
中科院分区:
地球科学3区
文献类型:
--
作者:
Hocking E

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智利中南部的潮汐沼泽沉积物为多次大地震提供了证据。硅藻转移函数是保存在沉积物中的物种与海拔之间关系的统计模型,它提供了与个别地震相关的同震垂直陆地水平变化的定量估计。然而,在智利中南部,由于缺乏对控制硅藻分布的环境变量的了解,我们量化陆地水平变化的能力目前受到限制,而环境变量是将硅藻化石组合的变化转化为对过去海拔变化的定量估计的基本先决条件。我们为该地区提供了一个新的现代硅藻数据集,并探讨了传递函数模型中使用的数据集的规模对重建陆地水平变化的意义。包含来自区域尺度的样本的现代训练集优于次区域和局部尺度的训练集,为1960年智利大地震期间的已知变形提供了更接近的估计,良好的现代类似物的比例更高,不确定性项比以前公布的重建项小42%。版权所有(C)2017作者。《第四纪科学杂志》由John Wiley父子有限公司出版。
Tidal marsh sediments from south‐central Chile provide evidence for multiple great earthquakes. Diatom transfer functions, statistical models of the relationship between species preserved in the sediment and elevation, provide quantitative estimates of coseismic vertical land‐level change associated with individual earthquakes. However, in south‐central Chile, our ability to quantify land‐level change is currently limited by a lack of understanding of the environmental variables controlling the distribution of diatoms, an essential prerequisite for converting variations in fossil diatom assemblages into quantitative estimates of past elevation changes. We present a new modern diatom dataset for the region and explore the implications of the scale of the dataset used in transfer function models on the reconstructions of land‐level change. Modern training sets containing samples from a regional scale are superior to sub‐regional and local‐scale training sets, providing closer estimates for known deformation during the great 1960 Chilean earthquake, a higher proportion of good modern analogues and uncertainty terms up to 42% smaller than previously published reconstructions. Copyright © 2017 The Authors.Journal of Quaternary SciencePublished by John Wiley & Sons Ltd.
智利中南部瓦尔迪维亚河口全新世出现期间大地震沉降的碎片证据
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