平面弹性波信号在地层介质中的传输损耗特性

通过分析弹性波在大地介质中传播的衰减机理，得到简单平行分层大地信道弹性波纵波信号传输总衰减模型，根据沉积地层情况分别建立了平行分层大地信道和准平行分层大地信道模型，并用射线追踪法对平面弹性纵波的传播进行了仿真。仿真结果表明：无论平行地层模型还是准平行模型，弹性波在入射角度小幅度变化的情况下（小于5°），传输衰耗特性曲线平坦，角度的小幅度变化会造成接收面信号到达位置的偏移，吸收衰减损耗远大于界面反射造成的功率损耗（1 500 Hz处相差约20 dB）。

Power loss characteristics of plane elastic wave signal propagating in layered earth medium channel

By analyzing the principles of elastic wave propagation in earth crust layer，the total attenuation model of longitudinal wave in simplified parallel layered earth medium channel was achieved，then a parallel layered earth channel and quasi parallel layered earth channel model were developed respectively.The propagation simulation of plane longitudinal wave was performed using ray trace method.The results show whether in parallel layered earth medium or quasi parallel earth medium，the variation of incident angle(less than 5°) has slight effect on transmission attenuation，but can cause an enlarged position offset，and medium absorption attenuation is lower than interface reflection loss of about 20 dB at frequency of 1 500 Hz.