The kanji which set the thing in which the meaning of sound like "雨" and a drum is shown.
Sound like a drum should resound far and wide in rain.
That is, the meaning of "thunder" is expressed.
It is visible just like the shout of the ground which breaks sky.
It seems that the earth has told us something desperately.
Probably a cry tends to be raised, feeling tends to be exposed and it is really going to transmit what?
Make the heart into sky and feel a roll of thunder.
The message to you may be entrusted there.