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首页> 外文期刊>Bulletin of earthquake engineering >Sensitivity of ground motion coherency to the choice of time windows from a dense seismic array in Argostoli, Greece
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Sensitivity of ground motion coherency to the choice of time windows from a dense seismic array in Argostoli, Greece

机译：希腊阿格多利茂密地震阵线选择时间窗的敏感性敏感性

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摘要

The stochastic estimation of coherency is perceived, in some studies, to be significantly influenced by the time window length under consideration. For the engineering purposes, usually, coherency is estimated from the strong motion, i.e., the shear (S-) wave segment of the recorded time series. However, the identification of a purely S-wave dominated window could be challenging in case of complex wave mixing on the seismograms. Moreover, there has been relatively little research on how much variation, in reality, is introduced in the coherency estimates owing to the choice of signal length. Therefore, the debate about the procedure for selecting a representative time window has remained inconclusive: different authors keep their different practices. The current article is an effort to shed light on the sensitivity of the coherency estimates to the choice of various time windows. The research draws on the dataset gathered from a dense seismic-array deployed at the small size, shallow alluvial valley of Koutavos-Argostoli, situated in Cephalonia Island, Greece. The lagged coherency over interstation distance ranges from 5 to 80 m has been estimated from a set of 46 earthquakes having magnitude 2-5 and epicentral distance 3-200 km, considering different lengths of time windows. The findings revealed that the statistics of coherency estimates derived from many events is only weakly sensitive to the selection of time window lengths provided that the segments include the same energetic pulse.
机译：在一些研究中，感知一致性的随机估计受到所考虑的时间窗长的显着影响。对于工程目的，通常，从强运动，即记录时间序列的剪切（S-）波段估计了一致性。然而，在地震图上的复杂波混合的情况下，纯粹S波导地窗口的识别可能是具有挑战性的。此外，由于信号长度的选择，在一致性估计中引入了多种变化的研究已经相对较少的研究。因此，关于选择代表时间窗口的程序的辩论仍然不确定：不同的作者保持其不同的实践。目前的文章是努力阐明相干性估计的敏感性，以选择各种时间窗口。该研究在从一群小尺寸，Koutavos-Agrostoli的小尺寸，位于希腊Cephalonia Island的小尺寸，浅褐色的冲积谷的数据集上绘制。考虑到不同长度的时间窗口，从5至80米的滞后距离范围为5至80米的滞后距离范围为5至80米。结果表明，从许多事件得出的一致性估计的统计数据仅对时间窗口长度的选择弱敏感，条件是段包括相同的能量脉冲。

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