Elastic Wave Signal Attenuation Characteristics in Layered Earth Channel

In this paper, 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 is achieved, then a parallel layered channel and quasi-parallel layered channel model developed respectively. The propagation simulation is carried out using ray-trace method, the results show: (1) attenuation degraded with the incident angle increased, (2) whether in parallel layered earth medium or quasi-parallel earth medium, the variation of incident angle has slight effect on transmission attenuation, but can cause an enlarged arrived position offset, (3) medium absorption attenuation is lower than interface reflection loss of about 20 dB at frequency of 1500 Hz.