constuct a graph of strain rate versus distance to the west of stable N. amriac. plot strain rate for each postion (i.e, neighboring pair of vectors) this can be done redily using the table you built in excel for the previous question. Recall that strain rate is ( change in length)/(original length)/time. change in length is the diffrent in vector lengthd and orignal length is distance between benchmarks. these values can quickly be calculated in excel. mark the location of the N Amraica- pacific plate boundary on the graph.

50NF 45 40 35 Juan de Fuca Plate Pacific Plate 3cm = 1000 km Here Cascadia Subduction Zone 120 min = 876 km 125W North American Plate 30 mm/yr B&R San Andres Fault 120 33 1110 km 115 555