Earth’s science unit 2 lesson 15 laboratory: earthquakes epicenter

Distance between the Tulsa, OK observatory and the center of this fictional earthquake: 20 kilometers.

An earthquake generates two major seismic waves that travel through the crest at different speeds:

Let and denote the speed of the two waves, respectively. Let , resembles the time required for each waves to reach the observatory.

Both and would represent the separation between the source and the observatory. Thus

Given the difference between   and :

( given that and  )

Note that wave speed data involved in calculations above came from an external source. You shall repeat those steps with speeds indicated on the worksheet if possible.

that tool would be a compass