CC's+post+assignment

Back to Index 1. Using Google Earth with the LIGO coordinates being 46°27'18"N 119°24'25"W, the distance between the epicenter and LIGO is 10,940.05 km.

2. Since the path does go through water, we can rule out S-waves. P-waves can travel between 5-8 km/s.

Distance = 10,940.05 km Speed = 5 or 8 km/s Time = Distance / Speed t = 10,940.05 / 5 or t = 10,940.05 / 8 t = 2,188.01 s or t = 1,367.6 s t = 36.5 mins or t = 22.8 mins

The time the earthquake occurred was 03:50:40 GMT. With the added time it would take for the earthquake to reach LIGO, the plots should show an earthquake between 04:13:28 - 04:27:10 GMT.

3. While the plots are hard to look at precise time, you can tell the earthquake does fall within the time, if a little fast. I believe that the reason the two graphs look different when in reality they actually start around the same time. If you look closely at the y graph, you'll notice a little rise in the graph before the large spike and in the z graph there is just a large spike up. Well since the y graph has a larger domain in the y-values, the peak of the large z-spike and the rise in the y-graph is actually around the same value. This probably means it is just an optical illusion that they start at different times. I looked at the bluestone data and it turns out only the y stationed filtered at the 0.3 to 0.1 produces a different time for the start of the quake. All the other filters and stations show the earthquake starting at the same time.