Answer:
Transform plate boundary
Step-by-step explanation:
Montana is a part of the North American plate. Towards the west of this city Montana, there is a transform plate boundary, where the Pacific plate slide past the North American plate, giving rise to the formation of the world-famous San Andreas fault. A large number of shallow focus destructive earthquakes are generated every year in this region. This is an earthquake-prone zone. This fault about 1200 kilometers long and passes through the city of California, and here the fault is a strike-slip fault which is right-lateral in nature.