| The Time-Frequency Energy Attenuation Factor and Its Application on the Basis of Gauss Linear Frequency-Modulated Continuous Wavelet Transform |
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| 作者姓名： | Liu Xiqiang |
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| 作者单位： | [1]EarthquakeAdministrationofShandongProvince,Jinan250014,China [2]InstituteofGeophysics,ChinaEarthquakeAdministration,Beijing100081,China [3]EarthquakeAdministrationofLiaoningProvince,Shenyang110031,China [4]EarthquakeAdministrationofYunnanProvince,Kunming650041,China |
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| 基金项目： | ThisprojectwassponsoredbytheScienceandTechnologyKeyProjectduringthe“TenthFive YearPlan” (2 0 0 1BA6 0 1B0 2 0 3 0 6 )andtheJointEarthquakeScience
FoundationofChinaEarthquakeAdministration (1 0 2 0 35 )，China . |
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| 摘 要： | Based on the Gauss linear frequency-modulated wavelet transform, a new characteristic index is presented, namely time-frequency energy attenuation factor which can reflect the difference features of waveform in earthquake focus mechanism, wave traveling path and its attenuation characteristics in focal area or near field. In order to test its validity, we select the natural earthquakes and explosion or collapse events whose focus mechanisms vary obviously, and some natural earthquakes located at the same site or in a very small area. The study indicates that the time-frequency energy attenuation factors of the natural earthquakes are obviously different with that of explosion or collapse events, and the change of the time-frequency energy attenuation factors is relatively stable for the earthquakes under the normal seismicity background. Using the above-mentioned method, it is expected to offer a useful criterion for strong earthquake prediction by continuous earthquake observation.
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| 关 键 词： | 时间 频率 调频载波 小波变换 特征指数 能量衰变 |
The Time-Frequency Energy Attenuation Factor and Its Application on the Basis of Gauss Linear Frequency-Modulated Continuous Wavelet Transform |
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| Liu Xiqiang.The Time-Frequency Energy Attenuation Factor and Its Application on the Basis of Gauss Linear Frequency-Modulated Continuous Wavelet Transform[J].Earthquake Research in China,2004,18(1):42-53. |
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| Authors: | Liu Xiqiang |
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| Institution: | Liu Xiqiang 1),Shen Ping 2),Li Hong 1),Shan Changlun 1),Ji Aidong 1),Zhang Ping 3) and Cai Mingjun 4) 1) Earthquake Administration of Shandong Province,Jinan 250014,China 2) Institute of Geophysics,China Earthquake Administration,Beijing 100081,China 3) Earthquake Administration of Liaoning Province,Shenyang 110031,China 4) Earthquake Administration of Yunnan Province,Kunming 650041,China |
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| Abstract: | Based on the Gauss linear frequency modulated wavelet transform, a new characteristic index is presented, namely time frequency energy attenuation factor which can reflect the difference features of waveform in earthquake focus mechanism, wave traveling path and its attenuation characteristics in focal area or near field. In order to test its validity, we select the natural earthquakes and explosion or collapse events whose focus mechanisms vary obviously,and some natural earthquakes located at the same site or in a very small area. The study indicates that the time frequency energy attenuation factors of the natural earthquakes are obviously different with that of explosion or collapse events, and the change of the time frequency energy attenuation factors is relatively stable for the earthquakes under the normal seismicity background. Using the above mentioned method, it is expected to offer a useful criterion for strong earthquake prediction by continuous earthquake observation. |
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| Keywords: | Continuous wavelet transform Time frequency energy attenuation factor The space difference characteristics The time change characteristics |
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