近地表低降速带地震波传播规律初探

Study on transmittable laws of seismic waves in unconsolidated layers

通过对沙漠区近地表地层大量微测井资料的对比分析发现,速度梯度带的存在可能是导致低降速带地震波衰减的一个重要原因.本文在沙漠地区低降速带速度结构分析的基础上,研究地震波在线性过渡体地层的传播规律,并同实际观测记录进行对比,从理论和实际上验证上述推论的正确性.

Through analyzing a lot of seismic data from micro-seismograms, we find that velocity gradient layers in unconsolidated sediments may arise attenuation of seismic waves. In the paper, based on the analysis of velocity structure of near surface in a desert area, we study the transmittable laws of seismic waves in linear transition layers and compare simulated data with practical seismic records. The results show that the velocity gradient layer zone is an important factor for seismic wave attenuation in unconsolidated sediment in the desert area.