Clipped seismic record recovery analysis based on the cubic spline interpolation algorithm

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Wen Peng, Dongwang Tao, Qiang Ma, Quancai Xie, Jiang Wang
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引用次数: 0

Abstract

The clipping of near-field seismic waveforms caused by instrument limitations results in the waste of lots of waveforms and hinders the effective advancement of seismic research projects like source parameter inversion, near-fault ground motion characteristics, and earthquake early warning (EEW). In this paper, we propose to use the cubic spline interpolation method to restore the clipping waveform to solve the near-field data loss. We evaluate the recoverability of seismic waveforms with different clipped levels through artificial clipping experiments and compare the recovery waveforms with the projection onto convex sets (POCS) method. The results show that the restoration deviation of the cubic spline interpolation method is less than 1% at the clipped point, for the records whose clipped amplitude does not exceed 50% of the peak. In addition, the restored phase feature of the cubic spline interpolation is closer to the real waveform than the POCS method. To verify the performance of this method in the realistic earthquake, we apply it to the Barkam Mw 5.9 earthquake. The results show that the peak ratio of the restored clipping records to the measured non-clipping records is close to 1, and the relative error of the response spectrum is less than 0.1. Finally, we apply this method to successfully restore about 60% of near-field clipped records from the 2022 Lushan Mw 5.8 earthquake, which provided more data support for the study of the near-field ground motion.

Abstract Image

Abstract Image

基于三次样条插值算法的剪切地震记录恢复分析
由于仪器限制造成的近场地震波形削波导致了大量波形的浪费,阻碍了震源参数反演、近断层地动特征和地震预警(EEW)等地震研究项目的有效推进。本文提出使用三次样条插值法恢复削波波形,以解决近场数据丢失问题。我们通过人工削波实验评估了不同削波水平的地震波形的可恢复性,并将恢复波形与投影到凸集(POCS)方法进行了比较。结果表明,对于削波幅度不超过峰值 50%的记录,三次样条插值法在削波点的恢复偏差小于 1%。此外,与 POCS 方法相比,三次样条插值法恢复的相位特征更接近真实波形。为了验证该方法在实际地震中的性能,我们将其应用于 Barkam Mw 5.9 地震。结果表明,恢复的削波记录与测量的非削波记录的峰值比接近 1,响应谱的相对误差小于 0.1。最后,我们应用该方法成功地恢复了 2022 年芦山 5.8 级地震中约 60%的近场削波记录,为近场地动研究提供了更多的数据支持。
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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.
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