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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Analysis of a 150 m sediment core from the co-seismic subsidence depocenter of the 2009 Mw=6.1 L'Aquila earthquake (Italy): Implications for Holocene-Pleistocene tectonic subsidence rates and for the age of the seismogenic Paganica fault system
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Analysis of a 150 m sediment core from the co-seismic subsidence depocenter of the 2009 Mw=6.1 L'Aquila earthquake (Italy): Implications for Holocene-Pleistocene tectonic subsidence rates and for the age of the seismogenic Paganica fault system

机译：2009 Mw = 6.1 L'Aquila地震（意大利）的同震沉陷震源150 m沉积物芯的分析：对全新世-更新世构造沉降速率和成地震波格尼卡断裂系统年龄的影响

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LAQUI-CORE was drilled in the co-seismic subsidence depocenter shown by DinSAR images in the Bazzano sub basin after the 2009 Mw = 6.1 L'Aquila earthquake. LAQUI-CORE aimed at gathering high-resolution integrated stratigraphy and defining its relationships with the Paganica and other active faults that yielded co-seismic subsidence. Lithostratigraphy and micropaleontological analyses indicate a Late Pleistocene-Holocene fluvial-alluvial sequence, and below 41 m palustrine sediments sandwiching at 84-115 m a thick gravel package. Four C-14 ages gathered from 5 to 15 m yield calibrated ages between 6 and 41 ka BP. Paleomagnetism reveals a normal polarity above 84 m, while below the gravel package (115 m) it shows frequent polarity changes. The occurrence of intervals of clear reverse polarity testifies below 115 m the deposition during the Matuyama Chron. We conclude that the normal polarity package, down to 84 m along with the underlying gravels, were deposited at high sedimentation rate (0.46 mm/yr for the upper 15 m) during the Brunhes Chron (<0.78 Ma), and lie over a much older Early Pleistocene palustrine sequence that we correlate with the well-known Madonna della Strada Synthem (1.2-1.7 Ma). We assume that the subsidence driving the deposition of the upper normal polarity sequence was due to the activity of the Paganica and neighbour faults during the Middle-Late Pleistocene. The lack of thick volcanostratigraphic markers, widespread in colluvial sediments from the L'Aquila plain older than 460 ka, suggests a normal-polarity sedimentation onset, thus a Paganica fault activity onset, around 4001
机译：在2009 Mw = 6.1拉奎拉地震后，在Bazzano子盆地的DinSAR图像显示的同震沉陷震中钻了LAQUI-CORE。 LAQUI-CORE旨在收集高分辨率的综合地层，并定义其与Paganica和其他产生同震沉陷的活动断层的关系。岩石地层学和微古生物学分析表明，晚更新世-全新世河流冲积层序，在41 m以下的古沉积物夹在84-115 m厚的砾石包裹中。从5到15 m收集了4个C-14年龄，屈服年龄在6到41 ka BP之间。古磁性在84 m以上显示出正常极性，而在砾石包裹（115 m）以下则显示出频繁的极性变化。在Matuyama Chron期间，清晰的反极性间隔的出现证明了在115 m以下的沉积。我们得出的结论是，在布鲁日纪年（<0.78 Ma）期间，低至84 m的正向极性包裹以及下面的砾石以高沉积速率（上部15 m为0.46 mm / yr）沉积，并且位于远处我们与著名的麦当娜德拉斯特拉达合成（Madonna della Strada Synthem）（1.2-1.7 Ma）相关的较早的更新世palustrine序列。我们假定驱动上正极性序列沉积的沉陷是由于中晚更新世期间帕格尼卡的活动和邻近断层的缘故。缺乏较厚的火山地层标志物，普遍存在于460ka以上的拉奎拉平原的河床沉积物中，这表明正极性沉积开始，因此Paganica断层活动开始于4001a。 DinSAR数据外推巴赞诺的0.25至0.50 mm / yr的沉降量以及Paganica断层的古地震学ing陷与LAQUI-CORE上部放射性碳测年产生的沉积速率（0.46 mm / yr）大致相符。这表明，晚更新世-全新世时期巴赞诺次盆地的同震沉陷主要由帕格尼察断层活动控制。 （C）2016 Elsevier B.V.保留所有权利。

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