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ISSN 2096-7780 CN 10-1665/P

承德地区宽频带倾斜仪与宽频带地震计同震响应融合分析

Fusion analysis of co-seismic response between broadband tiltmeters and broadband seismometers in Chengde area

  • 摘要: 本文以承德地震台VP型宽频带倾斜仪以及同址BBVS-120型宽频带地震计采集的同震波形为研究对象,利用小波分析和短时傅里叶变换的方法,分析二者记录到的6次地震同震波形的时频特征和频带响应,能量集中在0~0.5 Hz,二者的波形曲线形态、频带响应及功率谱密度均有较高的一致性。利用经验公式拟合出宽频带倾斜仪最大振幅与震级二者之间的关系,拟合度较好,得到承德地区宽频带倾斜仪近震和远震最大振幅转换公式。承德地区宽频带倾斜仪与宽频带地震计地震波的最大振幅有较好的对应关系。利用地震波体波震级计算公式,对宽频带倾斜仪和宽频带地震计记录到的地震选取其中的3次地震波计算体波震级,结果表明在地震波频率小于0.5 Hz时,二者计算出的体波震级对应关系较好。

     

    Abstract: This article focuses on the co-seismic waveforms collected by the VP type broadband tiltmeters and the BBVS-120 type broadband seismometer at the Chengde seismic station. Using the methods of wavelet analysis and short time Fourier transform, six seismic waveforms were analyzed, including time frequency characteristics and frequency band response. Energy is concentrated in 0~0.5 Hz. They have high consistency in waveform, frequency response, and power spectral density. Using empirical formulas to fit the relationship between the maximum amplitude and magnitude, the maximum amplitude formulas for the near and far earthquakes of the broadband tiltmeter is obtained. There is a good correspondence between the maximum amplitude of the broadband tiltmeters and the broadband seismometer in the Chengde area. Using the seismic wave body wave magnitude calculation formula, three seismic waves were selected to calculate the body wave magnitude for the earthquakes recorded by the broadband tiltmeters and broadband seismometer. The results showed that when the seismic wave frequency was less than 0.5 Hz, the corresponding relationship between the body wave magnitudes calculated by the two has a good correspondence.

     

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