Watsisname wrote:Source of the post So you can combine all these observations to build a model of what the interior structure of the Earth has to be, and it is extremely powerful. There is a surprising amount of information you can extract from these data, and in fact this is exactly where much of our knowledge of the structure of the Earth comes from.

Okay, thanks for explanations! Knew that about bats and some of the P and S waves, but now I understand more of it.

midtskogen wrote:Source of the post My seismometer is in the borderland of picking up Kim's explosions in N Korea

Little Kimmy is just playing around with his firecrackers and that's it.