本文探讨了弱地震信号低衰减传播的可能性。结果表明，地下的地震信号传播介质均表现出一定的弹性，振动信号幅度在低于介质弹性限度时传播，衰减很小，表现出低衰减特征。这一特点保证了可以在地面，甚至黄土覆盖区监测到微地震信号。

This article explored the possibility of spread of weak seismic signals and low attenuation. The results showed that both underground seismic signal propagation medium showed a degree of elasticity，the vibration signal amplitude，just below the elastic limit attenuation is very small，showing low attenuation characteristics. This feature ensures that on the ground，and even the loess coverage area of micro seismic signal detected.