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Title:: Analysis of the Characteristics of Coseismic Records of Five Wells' Water Level in Hainan Area in the M_S8.0 Wenchuan Earthquake Event

Author(s):: GU Shen-yi; LI Zhi-xiong; ZHANG Hui; (Earthquake Administration of Hainan Province,Haikou 570203,Hainan,China)

Keywords:: Wenchuan strong earthquake; digital records of well water level; coseismic effects; wavelet transform; Hainan area

摘要:: 对比海南地震台网记录的汶川M_S8.0地震的地震波形,分析了海南5口井的高采样率数字化水震波波形特征。采用傅立叶变换和小波分解方法,对海南前兆台网5个台水位仪在汶川M_S8.0地震中记录到的高采样率数字化水震波进行了频谱分析,结果显示地震波的不同波组激发的水震波波组差别较大,5口井的水震波周期跨度很大,从10多秒到1 000多秒,不同井孔的水震波幅度差别较大。同时还初步分析了水震波的形态和水震波各个频率组的形成机理。

Abstract:: By comparison of the seismic waves of M_S8.0 Wenchuan earthquake recorded by Hainan Digital Seismic Network and the water-seismic waves,the waveform characteristics of the water-seismic waves were analyzed.We also analyzed the spectrum and time features of the water-seismic waves with high sampling rate of Wenchuan earthquake recorded by five water-level meters of Hainan Seismic Precursor Network by means of FFT and Wavelet Transform.The result shows that the variation between the different wave groups of water-seismic waves caused by the different seismic wave groups were great; the periodic range of the water-seismic wave at the five well in Hainan area were large(from 10 s to more than 1000 s)and the difference of the amplitudes of water-seismic waves at different wells also were great.The formation mechanisms of waveforms and different frequency groups of the water-seismic waves were analyzed preliminarily.