LIGO+post-assessment+(JV)

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 * 1. Use Google Maps (or Google Earth—your pick) to calculate the distance from the quake’s epicenter to LIGO.**

Distance from earthquake to LIGO:10940.03km


 * 2. Calculate the seismic wave speed twice, once for each of the LIGO plots shown.**

Calculations: 10940.03 X (1/5km) X (1min/60sec) =36.4667 min 10940.03 X (1/3km) X (1min/60sec) =60.7779 min P waves:36.4667 S waves:60.7779 The biggest difference between the two maps is that in the first one (seen below) the waves are detected at about 4:15. In the second graph (seen below graph one) there is a subtle difference. The waves are detected a bit sooner closer to 4:00.
 * 3. Comment on any difference you see between the LIGO plots, and between the wave speed estimates obtained using each plot.**