Determine the time difference from the P wave to the arrival of the S wave on each seismogram and enter it into the box. For example, if you have stated that the S-P interval is 35 seconds, you will f...Determine the time difference from the P wave to the arrival of the S wave on each seismogram and enter it into the box. For example, if you have stated that the S-P interval is 35 seconds, you will find 35 seconds on the vertical (y-axis) and follow it across until it intersects the diagonal line. Open up a word document and insert both the picture of your earthquake location (the two side-by-side pictures) and the picture of your completion certificate and chart.