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首页> 外文OA文献 >Liquefaction features produced by the 2010-2011 Canterbury earthquake sequence in southwest Christchurch, New Zealand, and preliminary assessment of Paleoliquefaction features
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Liquefaction features produced by the 2010-2011 Canterbury earthquake sequence in southwest Christchurch, New Zealand, and preliminary assessment of Paleoliquefaction features

机译：新西兰基督城西南部2010-2011年坎特伯雷地震序列产生的液化特征以及古液化特征的初步评估

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Liquefaction features and the geologic environment in which they formed were carefully studied at two sites near Lincoln in southwest Christchurch. We undertook geomorphic mapping, excavated trenches, and obtained hand cores in areas with surficial evidence for liquefaction and areas where no surficial evidence for liquefaction was present at two sites (Hardwick and Marchand). The liquefaction features identified include (1) sand blows (singular and aligned along linear fissures), (2) blisters or injections of subhorizontal dikes into the topsoil, (3) dikes related to the blows and blisters, and (4) a collapse structure. The spatial distribution of these surface liquefaction features correlates strongly with the ridges of scroll bars in meander settings. In addition, we discovered paleoliquefaction features, including several dikes and a sand blow, in excavations at the sites of modern liquefaction. The paleoliquefaction event at the Hardwick site is dated at A.D. 908-1336, and the one at the Marchand site is dated at A.D. 1017-1840 (95% confidence intervals of probability density functions obtained by Bayesian analysis). If both events are the same, given proximity of the sites, the time of the event is A.D. 1019-1337. If they are not, the one at the Marchand site could have been much younger. Taking into account a preliminary liquefaction-triggering threshold of equivalent peak ground acceleration for an Mw 7.5 event (PGA7:5) of 0:07g, existing magnitude-bounded relations for paleoliquefaction, and the timing of the paleoearthquakes and the potential PGA7:5 estimated for regional faults, we propose that the Porters Pass fault, Alpine fault, or the subduction zone faults are the most likely sources that could have triggered liquefaction at the study sites. There are other nearby regional faults that may have been the source, but there is no paleoseismic data with which to make the temporal link.
机译：在克赖斯特彻奇西南部林肯附近的两个地点，仔细研究了液化特征及其形成的地质环境。我们进行了地貌制图，开挖了沟槽，并在两个地方（哈德威克和马尔尚）没有液化的表面证据的地区获得了手芯。所识别的液化特征包括：（1）喷砂（沿线性裂缝排列单一且对齐）；（2）将水泡或次水平堤防注入表土中；（3）与这些打击和水泡有关的堤防；以及（4）塌陷结构。这些表面液化特征的空间分布与曲折设置中滚动条的脊线密切相关。此外，我们在现代液化现场的发掘中发现了古液化特征，包括几处堤防和一口沙尘。 Hardwick站点的古液化事件的日期为公元908-1336，而Marchand站点的古石油化事件的日期为公元1017-1840（通过贝叶斯分析获得的概率密度函数的95％置信区间）。如果两个事件都相同，则在给定地点附近的情况下，事件发生的时间为公元1019-1337。如果不是这样，那么Marchand网站上的用户可能还年轻得多。考虑到Mw 7.5事件（PGA7：5）的等效峰值地面加速度的初步液化触发阈值为0：​​07g，古液化的现有量界关系，古地震的时机和估计的潜在PGA7：5对于区域性断层，我们建议Porters Pass断层，Alpine断层或俯冲带断层是最有可能在研究地点引发液化的源头。附近可能还存在其他区域性断层，但没有可用来建立时间联系的古地震数据。

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