Using GPS Data to Measure the Earth Introduction In the previous activity, we determined that there are places on Earth that are in slow but constant motion. However, a study of other places on the Earth shows us different results. Activity Using the data given you for Victoria, British Columbia, make a single graph of the North and East displacements during from 1/1/1997 to 12/31/2000. Determine the overall linear trend for the entire four-year timespan. Include the vector direction of the velocity with North being 0°. Velocity mm/day mm/yr 0.012 4.4 North-South 0.018 6.5 East-West Total Vector 55.9 55.9 (dir = ____°) There should also be hiccups in the data at periodic intervals. Find the velocity of the site only during one of those times. Include the velocity direction with North being 0°. vector’s Velocity mm/day mm/yr -0.058 -21.1 North-South -0.094 -34.4 East-West Total Vector 238.5 238.5 (dir = ____°) Compare the overall trend velocity with the one is bigger? By how “hiccup” velocity. Which much (how many times bigger)? How do their directions compare? ETS periods are faster by a factor of 5 and almost exactly in the opposite direction (difference of compass bearings is almost exactly 180 degrees)
Using GPS Data to Measure the Earth Introduction In the previous activity, we determined that there are places on Earth that are in slow but constant motion. However, a study of other places on the Earth shows us different results. Activity Using the data given you for Victoria, British Columbia, make a single graph of the North and East displacements during from 1/1/1997 to 12/31/2000. Determine the overall linear trend for the entire four-year timespan. Include the vector direction of the velocity with North being 0°. Velocity mm/day mm/yr North-South 0.012 4.4 East-West 0.018 6.5 Total Vector (dir = ____°) 55.9 55.9 There should also be hiccups in the data at periodic intervals. Find the velocity of the site only during one of those times. Include the velocity vector’s direction with North being 0°. Velocity mm/day mm/yr North-South -0.058 -21.1 East-West -0.094 -34.4 Total Vector (dir = ____°) 238.5 238.5 Compare the overall trend velocity with the “hiccup” velocity. Which one is bigger? By how much (how many times bigger)? How do their directions compare? ETS periods are faster by a factor of 5 and almost exactly in the opposite direction (difference of compass bearings is almost exactly 180 degrees)