Sphericaldivergence decreases energy with the square of the distance.
球面扩散使波的能量与传播距离的平方成反比。
2
Theoretical and practical results indicate that the method can compensate quite desirably the amplitude attenuation due to sphericaldivergence and earth absorption.
经过理论试算和实际处理表明，本方法能较好地消除球面发散和大地吸收对振幅的影响。
3
According to the definitions of grads, divergence and rotation, the expression in spherical coordinate system is given from the point of physics.