PSYA01H3 Lecture Notes - Lecture 1: Intraplate Earthquake, Continental Crust, North American Plate
Document Summary
2 large blocks of rock and an earthquake is triggered along a fault - which means breaks. Epicenter = center of the earth surface, directly above the focus. Epicenters - pick out a couple of things. Picks out the boundaries of the lithospheric plates. 3 types of plate boundaries (plates interact in different ways) Spreading centers where plates are moving apart. Oceanic crust converging with oceanic or continental crust produced subduction zones . Heavier one, the older one, that will subduct below the other one. Oceanic crust is always subducted because it"s heavier. Continental crust converging with continental produced obduction zones . Depths of earthquake foci identify types of plate boundaries. Continents are embedded in larger tectonic plates. The volcanoes that erupt are the youngest. Plates don"t move in a straight line - they rotate. They have to move around the surface of the globe. Each plate is rotating around its own pole.
