基于动态时间翘曲距离的地震动特征及相似性分析与评价

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2023-11-15 DOI:10.1007/s10950-023-10176-2
Haoxiang He, Haoding Sun, Yifei Chen
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摘要

由于地震动在时频域具有复杂的非平稳性,传统的地震波形比较评价方法在区分相似波的细节和变化特征方面能力和精度不足,使得波形的相似性评价难以准确量化。动态时间规整(DTW)算法可以精确地计算不同信号的相似度,从而用于波形比较和相似度评价。为了改进传统方法,提出了一种基于DTW距离的地震波形识别和地震动特征分析方法。在对大量地震波进行统计分析的基础上,得到了考虑振幅、时滞、噪声信号比、场址类型和综合效应的地台距离变化规律。实验证明,DTW距离可作为波形精化的兼容评价标准。验证了DTW距离与矢量范数在本质上是等价的。在地震动分析中,DTW距离与地震波的等效振幅和能量有关。通过对台站阵资料的分析,论证了DTW距离的物理内涵,结果表明,DTW距离的分布可以准确地反映该地区地震的时空变化效应。采用统计方法确定了DTW距离的合理参考范围,并提出了具有真实特征的综合多点地震动评价标准。在具有空间变异效应的人工地震动综合精度评价中,根据DTW距离的变化规律和范围对波形进行评价和优化,可以得到更真实特征的地震动组合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Analysis and assessment of ground motion characteristics and similarity using dynamic time warping distance

Due to the complex nonstationarity of ground motion in time–frequency domain, the traditional methods of comparing and evaluating earthquake waveforms have not enough ability and accuracy to distinguish the details and changing features of the similar waves, which makes the similarity evaluation of waveform is difficult to be quantified accurately. The similarity degree of different signals can be calculated precisely according to dynamic time warping (DTW) algorithm, so it can be used for waveform comparison and similarity evaluation. In order to improve the traditional method, a method based on DTW distance is proposed to identify the earthquake waveform and analyze the ground motion characteristics. Based on the statistical analysis of a great quantity of earthquake waves, the changes law of DTW distance considering amplitude, time lag, noise signal ratio, site type, and the comprehensive effect is obtained. DTW distance is proved to be used as a compatible evaluation standard for waveform refinement. It is verified that DTW distance and vector norm are essentially equivalent. In the analysis of ground motion, DTW distance is implicated in the equivalent amplitude and energy of earthquake waves. The physical connotation of DTW distance is demonstrated by analyzing the data of the station array, and the results show that the distribution of DTW distance can accurately imply the time–space variation effect of the earthquake in the region. The reasonable reference range of DTW distance is defined by statistical method, and the corresponding evaluation standard of synthetic multi-point ground motion with real characteristics is proposed. In the synthetic accuracy evaluation of artificial ground motion with spatial variation effect, the combination of ground motions with more real characteristics can be obtained by evaluating and optimizing the waveforms according to the variation rule and range of DTW distance.

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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
期刊最新文献
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