| Morlet变换在超宽频带地震仪记录的汶川震前数据处理中的应用 |
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| 引用本文： | 皮誉洋,周云耀,吕永清.Morlet变换在超宽频带地震仪记录的汶川震前数据处理中的应用[J].大地测量与地球动力学,2018,38(9):974-978. |
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| 作者姓名： | 皮誉洋 周云耀 吕永清 |
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| 摘 要： | 介绍了Morlet小波变换的基本原理和特点。以汶川地震为例，选取2008-05-01~05-12的地震计垂直向连续波形数据，使用Morlet小波变换得到时频谱。分析时频图发现，在汶川地震发生前的数十h中，0.1~0.2 Hz频段的能量幅值出现明显的递增趋势，是非台风扰动引起的频率异常，与已有论文结论符合良好，证明Morlet小波变换是分析震前频率特征的有效方法。
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| 关 键 词： | JCZ-1超宽频带地震仪 Morlet小波变换 时频分析 |
Application of Morlet Transform in Pre-Earthquake Data Processing of Wenchuan Earthquake Recorded by Ultra Broadband Seismograph |
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| PI Yuyang,ZHOU Yunyao,Lu Yongqing.Application of Morlet Transform in Pre-Earthquake Data Processing of Wenchuan Earthquake Recorded by Ultra Broadband Seismograph[J].Journal of Geodesy and Geodynamics,2018,38(9):974-978. |
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| Authors: | PI Yuyang ZHOU Yunyao Lu Yongqing |
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| Abstract: | This paper introduces the basic principles and characteristics of Morlet wavelet transform. As an example, we take the Wenchuan earthquake, using vertical continuous waveform seismometer data from May 1-12, 2008. We then acquire the time-frequency spectrums by means of Morlet wavelet transform. According to the time-frequency spectrums, the energy amplitude of the 0.1~0.2 Hz band shows an obvious increasing trend several hours before the Wenchuan earthquake. This is a frequency anomaly caused by non-typhoon disturbances, which is well in line with existing conclusions. It is proven that Morlet wavelet transform is an effective method to analyze pre-earthquake frequency characteristics. |
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| Keywords: | JCZ-1 ultra broadband seismometer Morlet wavelet transform time-frequency analysis |
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