【作者】 李学政； 潘常周； 张阿瑶；

【Author】 Li Xue-Zheng;Pan Chang-Zhou;Zhang A-Yao;Northwest Institute of Nuclear Technology;

【机构】 西北核技术研究所；

【摘要】 在土介质中实施了TNT为百公斤级当量的地下化学爆炸试验,开展了近场地震检测。地震实测数据显示,S波为优势震相。对S波进行傅立叶频谱变换和频谱校正,去掉几何扩散对频谱振幅的影响,计算得出介质非弹性吸收而引起的地震波衰减参数。不同频率的振幅随距离衰减指数是不同的,在0.5~30 Hz频带范围内,振幅衰减指数在0.8~1.3之间,10 Hz振幅衰减指数最大。Q值和频率具有正相关,Q值随频率以0.82指数增长。更多还原

【Abstract】 The chemical explosions were carried into execution in soil medium,the yield of which is at hundred kilometer level TNT.The seismic observation was organized at near field.The seismic data show that S waveform is preponderant phase.The waveform was transformed into Fourier spectrum,and the spectrum are corrected.As a result,amplitude effect produced by geometric diffuseness are removed.Seismic attenuating parameters produced by imperfectly elastic medium are calculated.Attenuating index of different frequency is not entirely equivalent.Amplitude attenuating index is between 0.8 and 1.3 from 0.5 Hz to 30 Hz.Attenuating index on 10 Hz is the largest among them.Research shows a positive correlation between Q value and frequency.Q value increases with seismic frequency for index 0.82.更多还原