Seismic Activity Project!! Please help me! So, I have to find the location of the epicenter of seismic activity. Of course, our project does not intend to find that of real seismic activity. This is a school project, in which my teacher will drop an object at some unknown location in a large room (our school gym), and we have to find out the location, based on the data recorded by three-four sensors we can place anywhere we want. I researched and figured out that the way scientists find the location of the actual epicenter of seismic activity is to measure the time difference between P and S wave, which will give distance (Based on a very easy formula, d=vt, we know v for each P and S and t for each P and S) for each three sensor, and draw the circle with its diameter corresponding to its distance from the epicenter, and triangulate the location. But, this is not a real earthquake; it's a fake one created by an object free falling on the ground made of wood. So my question was.. first of all, is it transverse wave created by the object? And second, how am I supposed to find the distance? The object and the floor do not create P and S wave like earthquake does. Our teacher said he will drop the object twice to create an "After-shock," which I'm supposed to use to figure out the distance from the epicenter to each three sensor. But, it does not make any sense.. scientists do not use after-shock of the earthquake to figure out the location of the epicenter.. or do they? According to my teacher, yes, but I'm completely confused.. If I know how to figure out the distance from epicenter to each three sensor, it is possible, I think, to triangulate the location. Please help me out. This is a really important project, and I really desperately need some guide. Thank you.