Explain the difference between sesmic waves on earth and those on the moon. Why is this importanat?

Answer 1

http://www.lpi.usra.edu/expmoon/Apollo15/A15_Experiments_PSE.html

Hope this helps.

Answer 2

The types of waves are basically the same. However, on Earth seismic waves tend to die out rather quickly (in minutes) because the solid layers of the crust absorb and damp them in a short time.

On the moon, however, seismic waves tend to reverberate for a long time, which leads selenologists to believe that there is no layered type structure or solid lithosphere to damp the waves. In effect, they believe the outer parts of the moon are fragmental and do not damp the seismic energy with the efficiencey of a solid crust.