韦士忠, 石汝斌, 李玉萍, 赵英芳. 用选频谱研究唐山余震序列较大地震前小震波谱和震源参数的某些特征[J]. 华北地震科学, 1989, 7(1): 43-51.
引用本文: 韦士忠, 石汝斌, 李玉萍, 赵英芳. 用选频谱研究唐山余震序列较大地震前小震波谱和震源参数的某些特征[J]. 华北地震科学, 1989, 7(1): 43-51.
Wei Shizhong, Shi Rubin, Li Yuping, Zhao Yingfang. STUDY OF SOME CHARACTERISTICS OF SMALL EARTHQUAKE WAVE SPECTRUM AND HYPOCENTRAL PARAMETERS BEFORE RELATIVE LARGE EARTHQUAKS IN THE TANGSHAN AFTER SHOCK SERIES BY SELECTED FREQUENECY SPECTRUM[J]. North China Earthquake Sciences, 1989, 7(1): 43-51.
Citation: Wei Shizhong, Shi Rubin, Li Yuping, Zhao Yingfang. STUDY OF SOME CHARACTERISTICS OF SMALL EARTHQUAKE WAVE SPECTRUM AND HYPOCENTRAL PARAMETERS BEFORE RELATIVE LARGE EARTHQUAKS IN THE TANGSHAN AFTER SHOCK SERIES BY SELECTED FREQUENECY SPECTRUM[J]. North China Earthquake Sciences, 1989, 7(1): 43-51.

用选频谱研究唐山余震序列较大地震前小震波谱和震源参数的某些特征

STUDY OF SOME CHARACTERISTICS OF SMALL EARTHQUAKE WAVE SPECTRUM AND HYPOCENTRAL PARAMETERS BEFORE RELATIVE LARGE EARTHQUAKS IN THE TANGSHAN AFTER SHOCK SERIES BY SELECTED FREQUENECY SPECTRUM

  • 摘要: 本文使用多道选频测震仪记录,通过计算选频谱,研究了唐山地震余震序列中1979年5月17日ML5.1地震前小震波谱和震源参数的某些特征。研究结果表明:5.1级地震前三个月内小地震的波谱与一般小震波谱有明显不同,前者高频潜密度较强,拐角频率较大,可见其震源等效半径较小,应力降较高。

     

    Abstract: With multichannel frequency modulated seismograms and calculation of the frequency spectrum, we have studied the spectral characteristics and focal parameters of small earthquakes occurring before a Ms=5.1 strong aftershock in 1979 in Tangshan. The results show that the wave spectra of small earthquakes occurring three months before this strong aftershock are obviously different from that of the other small earthquakes. Their spectral amplitude densities of highfrequecy and corner frequencies are higher. Therefore, it is concluded that the effective source radius are smaller and stress drop are higher.

     

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